Hi this is Rob. I will show you how to find

the X and Y intercepts of a function using the graphing feature of the TI 84 Plus CE

Calculator. We are going to use the polynomial equation

of x squared minus x minus 6. The first thing we need to do is graph this

equation. If you need more help on how to use the graphing feature of the calculator,

please see my video: How to Graph a Polynomial Function (Equation) on the TI 84 Plus CE.

I will put a link in the description below. OK, let’s get started. Press the y=key

on the top left of the calculator, here. Enter X, located on this key, then press this exponent

key, it moves the cursor to the exponent position. Enter 2. To move the cursor out of the exponent

position, press the right arrow key here. Then enter the rest of the equation. Minus

X, minus 6. Now press the Graph key located in the upper right, here. You should get this graph. if you don’t

get this graph you may need to reset your graphing window to the standard view. To reset

your graphing window, press the Zoom button here on top. Go down to number 6: ZStandard,

which stands for Zoom Standard. Press the Enter key. Now you can do a visual and see that the graph

crosses the x axis at negative 2 and positive 3. Those would be our x intercepts, but we

want to get a confirmation from the calculator. So next step is to press the 2nd key here,

then the trace key here. This brings up this Calculate window. Go to number 2: zero. Press

enter. You see the blinking cursor on the graph. On the bottom of the screen it is asking

for a Left Bound. We will confirm the x intercept at x equals negative two. So we want to set

a left bound left of x equals negative 2. Using the left arrow key, move the cursor

left of x equals negative two. That is good. Anywhere to the left of the x axis of negative

2. Press the enter key. Now the calculator is asking for a right bound. Move the cursor

using the right arrow key to the right of x equals negative 2. OK, right there is good.

Press the enter key. Now the calculator is asking for a guess of the value of the x intercept

within those bounds. Skip, this step and just press the enter button. And at the bottom

of the screen we see our answer. One of the x intercepts is at x=negative 2, y equals

0, or (-2,0). To find the other x intercept we will repeat

the steps. Press 2nd, trace. Go to number 2, zero. Press enter. On the bottom of the

screen it says Left Bound. With the right arrow key, move the cursor to the left of

where we think the other x intercept is located at x=3. Right there is ok. Press enter.

Now the calculator is asking for the Right Bound. Move the right arrow key until the

cursor is just to the right of x=3. Right there is good. Press enter. Now the calculator

says Guess, we skip that and press the enter key again. And there on the bottom of the

screen it says x=3 and y=0, that is the other x intercept. Now I am going to show you an easy way to

find the y intercept. Press the 2nd key then the trace key. This Calculate window appears.

Select 1:value. Press enter. The intercept occurs when x equals zero, so on the bottom

of the screen, type a zero after x=. Then press enter. And at the bottom of the screen

there is our y intercept at y equals negative 6. OK, that’s it. That is how to find the X

and Y intercepts of a function using the graphing feature of the TI 84 Plus CE Calculator. If you like this video please give it a thumbs

up and please subscribe to this channel.

like it….

Excellent

I love it i'm new to algebra as well Great!!!!!!!!!!!!!!!!!!!!!

Great resource. Your videos save much time. Thanks.

Big help…thanks!!!!!!!!!!!

Thank you Robert. Great Job!!!

Thank you very much for that, I finally get this before my final exam! it is save me life!!!

Great video, very helpful! Thank you!

thank so much i was so lost in my 1st lecture. really really thanks

hot dog!! thank you.

Thank you sir. You helped me out a lot

Thank you very much i was so lost!

Thank you!! Your videos help so much!!

Can i get the intercepts in terms of pi? Maybe if I set the window values in terms of pi?

How do you find x when y is given? Thanks!

Thank you tremendously!

Thank you.

I now know how this works, but why can’t it just be as simple as pressing zero and the displaying the intersects? There are just 2 of them

calclator

Thank gosh for your videos!!!

Mr. Friedman Gang wya?