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.

TI 84 Plus CE Calculator Find the X and Y Intercepts

21 thoughts on “TI 84 Plus CE Calculator Find the X and Y Intercepts”

• May 10, 2016 at 2:24 am

like it….

• August 24, 2016 at 11:54 pm

Excellent

• August 29, 2016 at 9:29 pm

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

• September 29, 2016 at 10:14 pm

Great resource. Your videos save much time. Thanks.

• October 2, 2016 at 11:46 pm

Big help…thanks!!!!!!!!!!!

• November 26, 2016 at 1:09 pm

Thank you Robert. Great Job!!!

• December 18, 2016 at 4:31 pm

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

• January 27, 2017 at 1:28 am

Great video, very helpful! Thank you!

• February 17, 2017 at 2:41 am

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

• May 8, 2017 at 12:54 am

hot dog!! thank you.

• August 30, 2017 at 1:47 am

Thank you sir. You helped me out a lot

• October 4, 2017 at 2:31 am

Thank you very much i was so lost!

• November 9, 2017 at 5:39 pm

Thank you!! Your videos help so much!!

• November 16, 2017 at 2:43 am

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

• July 3, 2018 at 11:06 am

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

• August 3, 2018 at 3:31 am

Thank you tremendously!

• September 10, 2018 at 6:58 am

Thank you.

• September 26, 2018 at 4:23 pm

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

• October 16, 2018 at 1:26 am

calclator