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Math Help - Irregular powers without a calculator

  1. #1
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    Irregular powers without a calculator

    How would I evaluate 9^(3/2) without a calculator?
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  2. #2
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by Naur View Post
    How would I evaluate 9^(3/2) without a calculator?
    see post #3 here, then you tell us
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  3. #3
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    WELL then I'd go 9^3 = 729, and then I'd root 729: 729^.5 = 27.
    And that works fantastically, thank you. But at the same time, it seems like it's cutting out even more work for myself. Though it works, I've got a timed exam coming up that I'm preparing vigorously for, and doing 9 cubed isn't going to save time...
    Do you know a quicker way? I could always verify with that method once I've finished the questions....

    Thanks a heap though
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    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by Naur View Post
    WELL then I'd go 9^3 = 729, and then I'd root 729: 729^.5 = 27.
    And that works fantastically, thank you. But at the same time, it seems like it's cutting out even more work for myself. Though it works, I've got a timed exam coming up that I'm preparing vigorously for, and doing 9 cubed isn't going to save time...
    Do you know a quicker way? I could always verify with that method once I've finished the questions....

    Thanks a heap though
    wouldn't it be easier to square root the 9 first and then cube the result?
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  5. #5
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    Why yes it would. Thanks very much.
    That'll do nicely.
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