Desmos

I have seen a number of solutions question on almost every blue book exam, if you're triggering the hard section.

These questions, many of my students do using Desmos, and I will tell you guys that method on these questions can be time consuming.

So there is a better way using something called the discriminant.

Let's take a look.

There it is.

Boom.

I have a lot of students, again, who love to plug this into Desmos.

But then you're swimming around trying to get to negative 50.

My name is Brooke, and I have been coaching the SAT and the ACT exams for over two decades.

I've also written two books on the ACT math section, which I hope you guys check out, and I've also done some other videos on TI calculators and the Desmos calculator, and you can check those out right here on my channel.

First of all, let's cover, how is this Evo different? Is it radically different? Can it do things that no other TI-84 can do? So first, the Evo has a redesigned body.

As you'll notice, all of the keys have printing on top of them, but you don't see little print on the body of the calculator itself, above keys, et cetera.

When you graph an equation, you can hit trace, and it will go automatically to points of interest.

If you hit a Y intercept or an X intercept, it will even label it Y intercept or zero, so you know that that is the exact point where you have a Y intercept or a, an zero.

And in some ways, dare I say, it's even clearer than Desmos because while Desmos will jump to points of interest, it does not label it Y intercept.

So there you go, kids, if you're looking for Y intercepts on tests.

Two problems with that.

One, now you have Desmos.

You can just throw it into Desmos and have Desmos do all the math for you.

Two, you can back solve and use the answers and plug them in.

Well, the college board and everybody else who runs standardized tests has figured that out.

Have you seen the new TI-84 EVO? And are you wondering, do I need to upgrade my TI-84? In this video, we're gonna put the TI-84 EVO to the test.

We're gonna see, is it three times as fast as its predecessors? and we're going to go over the new features that make this calculator different and answer the question should you upgrade depending on who you are and what your goals are texas instruments was nice enough to ship me this calculator and though this was gifted the opinions in this video are my own my name is brooke and i have been coaching the sat and the act exams for over two decades i've also written two books on the act math section which i hope you guys check out And I've also done some other videos on TI calculators and the Desmos calculator.

And you can check those out right here on my channel.

First of all, let's cover how is this Evo different? Is it radically different? Can it do things that no other TI-84 can do? So first, the Evo has a redesigned body.

When you graph an equation, you can hit trace and it will go automatically to points of interest.

If you hit a y-intercept or an x-intercept, it will even label it y-intercept or zero, so you know that that is the exact point where you have a y-intercept or a zero.

And in some ways, dare I say, it's even clearer than Desmos, because while Desmos will jump to points of interest, it does not label it y-intercept.

So there you go, kids, if you're looking for y-intercepts on tests.

You get what I'm saying.

Or you can pick a random K that is true in these parameters and you can kind of plug it into Desmos to be extra short.

But based on the fact that I can do all this math and I get down to a C is less than 6 and not a C is less than 0, I can say it's probably not right and I'm going to put D in.

And again, if you've got extra time at the end, you can kind of troll around in Desmos and make up numbers and see where you land.

But there you go.

So the third thing that I used was vertex form.

You get what I'm saying.

Or you can pick a random K that is true in these parameters, and you can kind of plug it into Desmos to be extra sure.

But based on the fact that I can do all this math and I get down to a C is less than six and not a C is less than zero, I can say it's probably not right and I'm gonna put D.

And again, if you've got extra time at the end, you can kind of troll around in Desmos and make up numbers and see where you land.

But there you go.

So the third thing that I used was vertex form, and then finally I'm using given information and then substitution, right? Which isn't part of my quadratics toolkit.