TI 84 Plus CE: Solving Square Roots and Other Radicals

How to solve Square Roots and Other Radicals using the TI84 Plus CE Graphing Calculator.

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- Hi, this is Rob.

We're gonna solve radicals on the

TI-84 Plus CE graphing calculator.

Let's get started.

First, press this mode button here.

This screen pops up.

I just wanna show you the current

settings I have on my calculator.

The items in black are
the current settings.

You can change the settings by

using the arrow keys and the enter button.

Get out of the screen by
pressing the clear button.

Okay, first radical is the
negative square root of 49.

Press the negative sign here;
do not press the minus sign.

Next press the 2nd key, next
press the x squared key.

The square root symbol appears

with a dotted box under the square root.

Enter the 49.

This right arrow symbol also appears.

Press the right arrow key to

exit out of the radical symbol.

Now we're ready to solve this square root.

Press the enter button and
there's the answer, negative 7.

Press the clear button.

This problem is the cube
root of a negative 512.

To do cube roots, press the math key.

This window pops up.

Go down to number four and
press the enter button.

This window pops up.
Enter a negative 512.

Make sure to use the negative sign here,

and not the minus sign.

Click the right arrow button to get that

blinking arrow under the
radical sign out of there.

Now press the enter key
to solve this cube root.

And there's the answer, negative 8.

Press the clear button
for our next problem.

In this problem, we take
the fifth root of 32.

Press the math button,
this window appears.

Go down to number five
and press the enter key.

This window appears.

Enter a five.

Now press the right arrow key to move

the cursor into the radical sign.

Now enter a 32 and press
the right arrow key.

Press the enter key to get the answer.

And there is the answer, two.

Okay, the next problem is the
square root of a negative 36.

Press the 2nd button,

then this x squared button,

which is also the square root button.

You know the drill: enter a negative 36

and press the enter key.

And we get an error message.

Because this type of radical
involves imaginary numbers.

Imaginary numbers is an
advanced topic in algebra.

If you're going to work
with imaginary numbers,

you need to change the mode
settings in the calculator.

Press the clear button to
escape this error message.

Press the mode key here,
this screen appears.

Go down here and
highlight this a plus b i.

Use the arrow keys to go
down and to the right.

Highlight it in black and
then press the enter key.

Now we're ready to go back to the problem.

Press the clear key.

You can see here that the mode has changed

from real numbers to imaginary numbers.

Re-enter the square root of negative 36.

Now press the enter key
to solve the problem.

And there is the answer, a six i.

Okay, that is it.

That is how to work with radicals

on the TI-84 Plus CE graphing calculator.

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