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Math Help - How do I calculate roots with the 15c?

  1. #1
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    How do I calculate roots with the 15c?

    I'm trying to calculate the cube root of -8, for example, so I type in these buttons:


    8
    CHS (change sign)
    Enter
    3
    1/x
    y^x


    But it gives me an error. What is the correct way to go about doing this?
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  2. #2
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    Re: How do I calculate roots with the 15c?

    (-8)^(1/3) would suffice.

    I'm not sure exactly how to put that in your calculator though.
    Last edited by Moebius; May 12th 2012 at 02:17 PM.
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  3. #3
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    Re: How do I calculate roots with the 15c?

    HP-15c power calculations from this owner's manual ...

    http://hp15c.org/hp15c.pdf
    Attached Thumbnails Attached Thumbnails How do I calculate roots with the 15c?-calculator-instructions.jpg  
    Last edited by skeeter; May 12th 2012 at 02:45 PM.
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    Re: How do I calculate roots with the 15c?

    (-8)^(1/3) is exactly what I am doing in my original post. If you look at the picture in skeeter's attachment it is the exact steps I am doing.

    Input 8,
    CHS (change sign) to make (-8),
    Enter to store the (-8),
    Then input 3,
    1/x to get the reciprocal of 3 which is (1/3),
    y^x to raise (-8) (which is y) to the (1/3) power (which is x).

    I don't get what I am doing wrong, it should make sense enough to calculate...
    Last edited by daigo; May 12th 2012 at 03:39 PM.
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  5. #5
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    Re: How do I calculate roots with the 15c?

    Have you tried calculating the positive root, (8)^(1/3)? If that works you can always calculate the positive roots and just add the negative sign.
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