English - TI 84 Plus CE: Solving Square Roots and Other Radicals | Amara (2025)

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    - Hi, this is Rob.

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    We're gonna solve radicals on the

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    TI-84 Plus CE graphing calculator.

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    Let's get started.

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    First, press this mode button here.

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    This screen pops up.

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    I just wanna show you the current

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    settings I have on my calculator.

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    The items in black are
    the current settings.

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    You can change the settings by

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    using the arrow keys and the enter button.

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    Get out of the screen by
    pressing the clear button.

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

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

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

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    The square root symbol appears

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    with a dotted box under the square root.

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    Enter the 49.

  • This right arrow symbol also appears.

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    Press the right arrow key to

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    exit out of the radical symbol.

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    Now we're ready to solve this square root.

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

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    Press the clear button.

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    This problem is the cube
    root of a negative 512.

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    To do cube roots, press the math key.

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    This window pops up.

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    Go down to number four and
    press the enter button.

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    This window pops up.
    Enter a negative 512.

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    Make sure to use the negative sign here,

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    and not the minus sign.

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    Click the right arrow button to get that

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    blinking arrow under the
    radical sign out of there.

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    Now press the enter key
    to solve this cube root.

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    And there's the answer, negative 8.

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    Press the clear button
    for our next problem.

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

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    Press the math button,
    this window appears.

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    Go down to number five
    and press the enter key.

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    This window appears.

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    Enter a five.

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    Now press the right arrow key to move

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    the cursor into the radical sign.

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    Now enter a 32 and press
    the right arrow key.

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    Press the enter key to get the answer.

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    And there is the answer, two.

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

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    Press the 2nd button,

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    then this x squared button,

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    which is also the square root button.

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    You know the drill: enter a negative 36

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    and press the enter key.

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    And we get an error message.

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    Because this type of radical
    involves imaginary numbers.

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    Imaginary numbers is an
    advanced topic in algebra.

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    If you're going to work
    with imaginary numbers,

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    you need to change the mode
    settings in the calculator.

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    Press the clear button to
    escape this error message.

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    Press the mode key here,
    this screen appears.

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    Go down here and
    highlight this a plus b i.

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

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    Highlight it in black and
    then press the enter key.

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

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    Press the clear key.

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    You can see here that the mode has changed

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    from real numbers to imaginary numbers.

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    Re-enter the square root of negative 36.

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    Now press the enter key
    to solve the problem.

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    And there is the answer, a six i.

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    Okay, that is it.

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    That is how to work with radicals

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    on the TI-84 Plus CE graphing calculator.

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    If you like this video,
    please give it a thumbs up,

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    and please subscribe to this channel.

  • English - TI 84 Plus CE: Solving Square Roots and Other Radicals | Amara (2025)
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