Desmos Calculator Tips (ep 4): Digital SAT Strategy Guide
Summary
TLDRMike Sattell, founder of Sattell Tutoring, presents a guide on utilizing the Desmos calculator for the digital SAT. He emphasizes the calculator's ease of use and its ability to visualize algebraic concepts, making complex problems simpler. The video covers graphing systems of equations, solving for x without an equation, and using sliders for guess and check strategies. Sattell encourages practice with the calculator to familiarize oneself with its features and to improve overall SAT scores.
Takeaways
- π Mike Satter is the founder of Satell Tutoring and is providing strategies for the digital SAT in a 10-part video series.
- π₯ The video focuses on effectively using the built-in Desmos calculator for the digital SAT, which eliminates the need to bring a separate calculator.
- π Desmos calculator is primarily a graphing calculator that allows real-time visualization of equations and is free to use at desmos.com/calculator.
- π The Desmos calculator can greatly aid in solving complex math problems with ease and minimal practice.
- π The video demonstrates four specific ways to use the Desmos calculator: graphing and solving systems of equations, solving for x without an equation, visualizing changes to equations, and using SAT strategies like guess and check.
- π€ The Desmos calculator is considered superior to traditional graphing calculators due to its intuitive interface and fewer buttons.
- π By using the Desmos calculator, students can avoid common mistakes and save time on the SAT, especially for system of equations and algebraic problem-solving.
- π‘ The video emphasizes the importance of practice with the Desmos calculator to become familiar with its functions and shortcuts.
- π― The Desmos calculator helps visualize algebra, making abstract concepts more concrete and easier to understand.
- π The video encourages students to use the calculator as much as possible during the SAT to maximize efficiency and minimize errors.
Q & A
What is the main topic of Mike Satell's fourth video in his 10-part series?
-The main topic of the video is how to effectively use the built-in Desmos calculator for the digital SAT.
Why does Mike Satell recommend subscribing to his channel for those planning to take the SAT?
-He recommends subscribing because viewers can access all the videos and resources he has released, which are interrelated and provide a comprehensive understanding of strategies for improving the overall SAT score.
What is unique about the Desmos calculator according to Mike Satell?
-The Desmos calculator is unique because it is a graphing calculator that is built into the digital SAT app, it's free, and has an intuitive interface with fewer buttons, making it easier to use than traditional graphing calculators.
How does Mike Satell suggest using the Desmos calculator for systems of equations?
-He suggests entering the equations into the calculator, which will then graph them and automatically calculate the points of intersection, including X and Y intercepts, allowing for quick solutions without the need for algebraic manipulation.
What is a common trap that test-takers might fall into when solving systems of equations using the Desmos calculator?
-A common trap is mistaking the coordinates of the points of intersection, such as confusing a positive number with a negative one, leading to the selection of incorrect answer choices.
How does the Desmos calculator handle equations with no Y coordinate or variable?
-The Desmos calculator can graph equations with no Y coordinate or variable by displaying vertical lines at the X values derived from the equation, allowing users to identify valid answers like -5 or 3 as shown in the example.
What strategy does Mike Satell advise for dealing with complex equations involving square roots?
-He advises entering the equation as written into the calculator, utilizing the keyboard function to input square roots and other complex elements, and then letting the calculator solve and graph the equation to identify the correct answers.
How can the Desmos calculator assist in visualizing changes to equations and graphs?
-The Desmos calculator can visualize changes by allowing users to manipulate functions and equations directly on the graph, such as adding or subtracting terms, and observing the immediate impact on the graph's shape and position.
What is the advantage of using the Desmos calculator for guess and check strategies?
-The advantage is that the calculator enables quick testing of different values and immediate visual confirmation of the results, reducing the time and effort required compared to manual guess and check methods.
What does Mike Satell emphasize as the most important aspect of using a graphing calculator for the SAT?
-He emphasizes that the most important aspect is the ability to visualize algebra, as it allows test-takers to see the shapes and movements of equations and understand complex concepts more intuitively.
What advice does Mike Satell give for test-takers on when to use the Desmos calculator during the SAT?
-He advises test-takers to practice with the calculator to know when to use it and when to rely on pencil and paper methods, and to use it as much as possible to minimize errors and maximize efficiency.
Outlines
π Introduction to Desmos Calculator for SAT
In this introductory segment, Mike Satell, the founder of Satell Tutoring, begins the fourth video of his 10-part series focused on strategies for the digital SAT. He emphasizes the Desmos calculator, a built-in tool for the SAT app, and encourages viewers to subscribe to his channel for comprehensive resources. Mike highlights the Desmos calculator's basic features and how they can significantly impact one's SAT score with minimal practice. He also mentions that while other tutors have created programs detailing the calculator's functions, his video will focus on the highlights and quick strategies for using the calculator effectively.
π Graphing and Solving Systems of Equations
Mike demonstrates how to quickly graph and solve systems of equations using the Desmos calculator. He advises against wasting time on algebraic solutions and instead shows how the calculator can efficiently identify points of intersection. Mike warns viewers to avoid common traps set by the SAT, such as confusing x and y coordinates, and emphasizes the importance of double-checking work. He also discusses the benefits of using the calculator over traditional algebraic methods, noting that it reduces the chance of making careless mistakes and saves time.
π’ Dealing with Equations without Y Coordinates
In this part, Mike addresses a unique situation where an equation lacks a Y coordinate or variable. He explains how to input such equations into the Desmos calculator and how it handles square roots and other complex elements. Mike points out that while the calculator doesn't graph these equations as traditional curves, it still provides the correct x values, represented as vertical lines. He stresses the importance of practice to familiarize oneself with the calculator's functions and argues that the calculator's algebra-solving capabilities can save significant time and reduce errors.
π Adapting to Changes in Equations and Visualizing Algebra
Mike discusses how to adapt to changes in equations, specifically focusing on a scenario where an f(x) equation is altered to form a new G(x) equation. He illustrates how the Desmos calculator can visually show the shift in the graph of the equation, helping to identify the minimum value of G(x). Mike emphasizes the calculator's ability to visualize algebraic concepts, which can be particularly helpful for those who struggle with abstract algebraic thinking. He also touches on the SAT's tendency to create situations where mistakes are likely, advocating for the calculator's use to minimize errors and verify instincts.
π Conclusion: Maximizing the Desmos Calculator's Potential
In the concluding segment, Mike reviews the key points discussed in the video, reiterating the Desmos calculator's usefulness in graphing systems of equations, solving complex algebra, and visualizing changes in equations. He stresses the importance of practicing with the calculator to become comfortable with its functions and shortcuts. Mike also acknowledges that while the calculator is a powerful tool, it won't solve every SAT question and that some problems will require manual solutions. He encourages viewers to continue exploring the calculator's features and to seek out additional resources to enhance their SAT preparation.
Mindmap
Keywords
π‘Desmos calculator
π‘Digital SAT
π‘Graphing
π‘Algebra
π‘Subscription
π‘Practice
π‘Strategy
π‘Visualization
π‘Guess and check
π‘Trap answers
Highlights
Desmos calculator is built into the digital SAT app, eliminating the need to bring a separate calculator.
Desmos calculator is primarily a graphing calculator, allowing real-time visualization of equations.
The Desmos calculator is free and can be practiced with at desmos.com/calculator.
The calculator simplifies solving systems of equations by graphing and finding intersection points.
Desmos calculator automatically calculates X and Y intercepts for graphed equations.
It's important to avoid trap answers and double-check coordinates when using the calculator.
The calculator can handle equations with square roots, simplifying complex algebraic problems.
Desmos calculator allows for visualizing changes to equations and graphs, enhancing understanding.
Using the calculator can help apply SAT strategies like guess and check in a more intuitive way.
Desmos calculator is more intuitive and easier to use than traditional graphing calculators.
Practicing with the calculator at home helps familiarize users with its functions and shortcuts.
The calculator can solve for X even without a complete equation, by graphing and identifying valid answers.
Desmos calculator can be used to adjust and compare graphs, aiding in finding the minimum value of a function.
The slider feature on the calculator allows for easy guess and check of values in an equation.
The visual aspect of the Desmos calculator helps conceptualize abstract algebraic ideas more concretely.
By using the calculator strategically, students can save time and reduce the chance of making careless mistakes.
The Desmos calculator can handle a wide range of mathematical problems, making it a valuable tool for the SAT.
Transcripts
hey everybody I'm Mike satell the
founder of satell tutoring and this is
the fourth video in my 10 part series
covering all of the strategies for the
digital SAT but this video can be
watched in isolation I think in fact a
lot of you might come to this through
other means so you don't need to watch
all the others I'm just going to hit the
highlights for how to use the built-in
Desmos calculator but I do recommend
that you subscribe to my channel because
then you can see all the other videos
all the resources that I've released
they are all much more interrelated
working through different strategies and
kind of referencing other videos so if
you are a subscriber then you will get
to see the entire big picture which is
the best way to improve your overall
score I'll also include a few of the
more comprehensive analyzes of the
calculator strategy for the digital sat
in the description of my video some
other tutors have made some really great
programs that go through all the
different little things that the
calculator does but I wanted to as
quickly as possible give you the
highlights the stuff that can change
your strategy and your score with very
little practice and very little
understanding of how the calculator
works just using its basic features so
hopefully this will make a big change in
just a couple of minutes let me just
talk quickly about what with the Desmos
calculator even is it is built in to the
app that you will take the digital sat
on so you do not even need to bring a
calculator with you to the SAT anymore
now I still think you should something
simple something like a scientific
calculator just like this one it has you
know basic functions it does have some
more advanced stuff but I would only
really use it to do some crazy
multiplication or division or addition
like the more basic stuff let the Desmos
calculator be where all the fun stuff
happens and that's because the Desmos
calculator is a graphing calculator
mostly so we can see all these equations
in real time
and the best part about it is it's free
and you can use it right now if you want
by going to desmos.com calculator I
definitely recommend that you're
planning to take the SAT you use this
calculator in your practice so you can
get used to how it feels and what it
does and where all the buttons are it's
definitely a little complicated at first
but with practice it should be second
nature how to work through some very
complicated math and make it much much
easier in this video I'm going to show
you four specific things okay I'm going
to show you how quickly we can graph and
solve systems of equations how we can
solve for x even if we don't have an
equation per se and I can show you how
we visualize changes to equations and
just graphs in general and how we can
use sat strategies like guess and check
even on this calculator so it does
really lend itself to the sat in
particular because it lets us play with
some things and test out answers in ways
that a normal graphing calculator might
not be able to do and that's the thing I
think that the Desmos calculator is
better than any real life calculator
graphing calculator they've ever seen it
just has fewer buttons things are more
intuitive it's easier to use so
hopefully you feel the same way let's
Dive Right into a first question here
this is pretty straightforward system of
equations you got two equations here and
in math class and school you would be
asked to solve this system probably
algebraically by either doing some sort
of substitution or elimination something
where we would eventually end up with an
x equals or a y equals but I wouldn't
bother with any of that here don't waste
your time the calculator at its best is
just going to let you see where the
point of intersections are so you can
see here I've already taken the time to
just enter the two equations make sure
that they're correct that you don't
accidentally enter the wrong numbers but
otherwise just enter them in and if you
look at the red line here you can see
that it's also automatically calculating
your X and y-intercepts that's very
convenient for other questions but the
blue line is off the screen so we should
scroll around until we find a point of
intersection and again if you click it
you'll see it just pops up it does the
calculating for you negative 9 negative
44. so what's happening here though is
they're trying to get you into a trap
with Choice C so we should zoom out or
we can hit the home button to go back to
the origin and now find another point of
intersection that actually gives us an
answer choice and if we zoom out we can
see there's the one that we had before
negative 9 negative 44 and now 14 is the
correct answer because that is the x
coordinate of the other point of
intersection
so what do we have to do to solve this
question basically just type some stuff
into a calculator and scroll around and
boom the calculator just gives you the
answer of course there are going to
still be some trap answers maybe we
misread a number we confuse that 9 and
negative 9 are different numbers and so
we pick C or sometimes what they'll do
is they'll ask you to solve for x but
then they'll give the y coordinate of
the point of intersection just to
confuse you so always double check those
things but otherwise there's really no
way to make some careless mistakes here
whereas if I did solve this with algebra
it would be long it would be tedious and
the chance of me just calculating
something wrong moving an X in the wrong
place it's very very high and so I could
waste a lot of time just to get the
wrong answer this is so much better
pretty much every system of equations
you're now going to want to enter into
the calculator some of you who are
really great at algebra might find some
situations where it's better to do it by
hand to use your scrap paper and and
show the work but you know with practice
you'll you'll figure out those
situations and for some of you if you
don't have that sense of whether it's
going to be easier to do by hand or
easier doing the calculator then just
always do it in the calculator it
doesn't matter it's still going to be
effective and efficient if you enter
these things quickly
let's look at a slightly weirder
situation uh here's another equation but
this time it's just one equation notice
there's no Y coordinates no y variables
here so
um there are a couple of ways to handle
this uh definitely though if I were
looking at it I'd be like I don't really
want to solve this algebraically by hand
because it's got square roots it just it
seems risky and what we should do then
is enter it as written into the
calculator so if you're having trouble
with square roots you can hit the button
on the bottom the little keyboard button
and it'll bring up all the functions so
you can hit that and then you can type
the rest so 3x minus 10x equals
or you can also type the letters sqrt
and it'll Auto generate the square root
symbol for you so this is why you should
practice at home get used to that stuff
um when we graph it you'll see that we
get these two vertical lines and if we
zoom out they're just kind of straight
lines up and down the whole way so
there's nothing fancy it's on a curve
like the other ones before but they
happen at negative five and at three
and basically that's just giving us the
answer either negative five or three
would be valid answers to this question
you don't need to Bubble both right
notice the question just says what is
one possible value so just pick one but
both are acceptable
so let me just explain what's happening
here because there's no y equals this
calculator is not graphing this like we
would think of like a regular line or a
parabola or anything that kind of Curves
around it it doesn't have the kind of
shape that a normal equation with a Y
and an X would have
but what the calculator is kind of doing
here is just solving the algebra for us
so it's it's kind of ending in the same
place that you would end if you did this
by hand right you'd have x equals
negative 5 and x equals three as your
two answers and you box them and you'd
be like hey I did it so what that looks
like though is a vertical line at
negative five is the x equals negative 5
equation and to draw x equals three on a
graph you would get a vertical line at x
equals three so it's kind of just giving
you the X values but they're gonna look
like these vertical lines but that's
okay as long as you're comfortable with
that you you've just let the computer do
all this solving for you that's awesome
that's what we want
um the the reason I would definitely do
that here is the square roots
the square roots maybe are also causing
a little bit of a problem that I noticed
sometimes with this strategy which is we
can't click the x-intercept and and get
the actual point like we could before
when you're doing the intersections or
the intercepts there so I think that the
reason that happens is the square root
is just like a messy thing and the the
computer can't really like give us that
point but it doesn't matter right we
could zoom in we can kind of clearly see
that the the lines go through negative
five and three I guess it's possible
that instead of going through three it
goes through like
2.99999999 forever but like the odds of
that happening are very slim and and we
can of course keep zooming in and really
just make sure that the vertical line is
where it looks to us and that saves us a
huge amount of time and headache and
chance of a mistake by actually being
able to just let the the machine the
calculator do the calculating for us so
not only is it a graph but it also is an
algebra solver this is really really
helpful and just like before there might
be cases there probably will be cases in
fact we're letting the calculator do the
algebra is a waste of time the algebra
is so easy or something that it's just
better to just do it yourself
but again if you are not good at
determining those situations then you're
probably just not good at algebra and so
you probably do want to default to the
calculator as much as possible to just
do as much of the work as possible for
you because you cannot be trusted to do
it yourself without errors but this is
why you practice the the test the same
way you would take the test have the
calculator ready to go and know when try
to figure out when you should go to it
and when you should do things with a
pencil pencil and paper your scrap
um let's take a look at another one
here we have a a question that would
definitely throw people off it's giving
us an f of x equation that's kind of
complicated it's also then telling us to
change that equation in some way by
talking about a new equation G of X that
has this f of x minus four piece
um and then we have to find the minimum
value of both of these or I guess I'm
the G of X equation so what would throw
people up here is they don't understand
like intuitively how the graph is going
to move some of you might
but I do find that this is also one of
those cases where people are prone to
error so I wouldn't trust just my logic
and my knowledge I'd want the calculator
to show me that my instincts are correct
so what we can do is not only use y
equals to set up an equation but we can
use function notation itself so we have
f of x here setting us up so that way we
can type the original f of x equation
and then the second line I typed the G
of X equation using f of x and so it's
literally just the two things that they
gave us in the question I just type them
as is and let's see it's going to show
us what happens as we change this so you
can see oh here yes the letters are all
given so if you can if you have a
keyboard for some reason you can always
find the letters in the keyboard thing
and we get a parabola and there's our
vertex negative 12 4 and you can see
there's a trap because that's the
original minimum but if we turn on the G
of X we see that it shifts to negative
eight which is the correct answer and we
can turn off the one we don't want so
we're not confused and and that's really
it is is we're able to see this graph
move in a direction rather than have to
actually just like guess it what the
direction is going to be or think about
it we can see it and know for sure so
there are definitely ways to do this
manually to find the vertex of a
parabola manually to shift a graph
manually
but why why do it why even open the door
to a possible careless mistake just let
the computer solve it for you let the
calculator Desmos do the work and and
that's really kind of like the whole
point of this is that you have to
recognize the SAT is very good at
creating situations where you're going
to make a mistake it's good at forcing
errors
so knowing that we have to be humble and
doubt ourselves and be able to just know
when to to put it into the calculator
instead and let that thing do the work
let's look at one more situation where I
think it would be difficult uh with any
other graphing calculator to kind of
solve in a in a good way so here's a
question where we don't have an equation
actually we have an expression so
there's no equal sign but you can see I
set up the first equation the first
expression as an equation by just
throwing in a y equals and basically
what that lets me do is is see this
thing more like the kinds of grass I'm
used to right where it kind of moves
along the x-axis and goes up and goes
down and all that stuff so I'll zoom in
in a second but you can kind of see it's
got like a little bump at the origin
now they're asking us to figure out what
the an equivalent expression would be so
uh we can definitely just take this
second equation and type it into the
second line and again I'm going to use a
y equals to do that
and we can see the keyboard will let us
do all of this if we don't want to type
or we don't have a keyboard so y equals
and I'm going to type the 3 and then
obviously create a fraction is just
division so just use the division symbol
and then x squared plus K and you'll see
when I hit the k
it's in the letters and we get this
option to add a slider so we're going to
click that and we can see a new line
comes up and it literally is a slider if
you slide it you see all the different
versions of this equation as if K is
different numbers but we don't want it
to be random numbers let's try the
numbers that are in the choices so we do
seven and we zoom in we can see these
these two expressions are very similar
but look they're not quite the same
there's a little difference so if we
change it to eight though we can see now
the two green and black lines overlap
and we can turn them on and off and see
that it's literally the same thing if we
try the other choices we can see again
21 they're different 392 it's going to
be different and so we know now that 8
is the answer because we were told to
find an equivalent expression and by
playing with this value of K with a
different guess and check answer choices
that we have we can see which one gives
us the graph that's the same so normally
you know old SAT no calculator we would
have to do this by hand and think about
this conceptually and algebraically and
understand why the equations are
actually the same but with the graphing
calculator we can just see what's going
on much more easily we can test these
different numbers out even if we don't
know it for sure the slider lets us plug
things in we can either use the slider
that's there or you saw me typing the
specific numbers that I wanted and as I
change them the graph of the equation
changed as well and we can just wait
until we get the equation that we want
because the graph will be what we want
it to be and so these equivalent
expressions should produce equivalent
graphs and they only did it eight I
could see it there was no doubt in my
mind in fact I still don't really know
why that's the case I don't care I have
the answer and so very quickly within
just a few seconds this very hard
question becomes much easier and you can
get it confidently and there will there
will be plenty of questions where you
can't use the calculator this way but
now you have more time to do the hand
and scrap paper kind of stuff that you
need for those other situations it's
really the calculator is a great tool it
is not going to solve every single
question on the SAT but if you can use
it more often to claw back some time
then for the truly difficult stuff you
will be able to kind of hopefully finish
just by doing it by hand
let's review what we talked about here
again the calculator is built into the
section you don't need to bring a
calculator but you can if you want just
have a backup but you should get
comfortable with the Desmos calculator
as you practice get used to where the
buttons are get used to how to type
things get used to all the little
shortcuts and like I said there are
other tutors out there with videos that
are much longer that are going to go
into much more detail about what this
calculator can do there are some other
features I'm skeptical of some of them
as as being more efficient but maybe for
you you'll like them so go into that
other tutors and check out what they're
doing but for me the the key pieces are
what we talked about it lets us graph
systems of equations very easily it lets
us solve for x for very difficult
algebra very easily and we can kind of
use this slider to play around and even
if we don't have a specific value we
have to kind of find a value we can
guess and check our way to it and the
the third bullet point there is I think
the most important one in in all of
these cases the thing that a graphing
calculator lets us do is visualize
algebra what so many people struggle
with in algebra is it's all kind of
conceptual and Abstract right what is
this x it's a number but it's not a
number it's a number we don't know and
so it's difficult to wrap your brain
around what's even happening but with
this uh graphing calculator we can see
what an equation looks like it creates a
shape right we could compare shapes we
can see shapes change and move and where
the shapes cross these are all really
powerful things that I think tap into
the way the human brain really works so
we're going to use the calculator to
just think the way our brain wants us to
think it's it's just a really great
addition to the test I think it's going
to make some of the math way easier for
a lot of you so we want to be able to
take advantage of it and I hope this
helped again there's more out there so
feel free to keep uh commenting on any
other new features that you really like
that I didn't get to in my my lesson
here but please subscribe go check out
the other lessons go learn about the
real strategies for the SAT the real
different stuff that that isn't unique
and that where you know with math
especially we might not be able to use a
calculator I will show you other
strategies so please subscribe it really
helps me out and remember when it comes
to your scores don't settle for less so
tell for more thanks for watching
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