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Math Help - Incredibly simple indices sum

  1. #1
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    Incredibly simple indices sum

    Can someone please use that math editor thing and change my post to write this equation down?

    4 to the power of 3/2 * 2 to the power of negative 1/2

    Anyway, thats the sum. My answer works out to 8 * 0.707 = 5.657, but in the math workbook the answer is 2. What am I doing wrong?
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  2. #2
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    Quote Originally Posted by yorkey View Post
    Can someone please use that math editor thing and change my post to write this equation down?

    4 to the power of 3/2 * 2 to the power of negative 1/2

    Anyway, thats the sum. My answer works out to 8 * 0.707 = 5.657, but in the math workbook the answer is 2. What am I doing wrong?
    1. Your term is a product and not a sum:

    4^{\frac32} \cdot 2^{-\frac12}

    2. Are you sure that you have posted the question correctly? If yes then your approximate result is correct. The exact value is \sqrt{32}.
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  3. #3
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    So my answer was correct then. \sqrt{32} = 5.657.

    Must be a typo in the book, because the way you wrote it out is exactly as it is in the book. Thanks!
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  4. #4
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    Hi Yorkey

    I also have problems with exponents. This video is good: http://www.mathplanet.com/education/...s-of-exponents

    I use this forum to ask questions and watch videos on http://www.mathplanet.com

    This forun rocks!!!!
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  5. #5
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    Quote Originally Posted by earboth View Post
    1. Your term is a product and not a sum:

    4^{\frac32} \cdot 2^{-\frac12}

    2. Are you sure that you have posted the question correctly? If yes then your approximate result is correct. The exact value is \sqrt{32}.
    \sqrt{32} would be better written as 4\sqrt{2}.
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  6. #6
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    Quote Originally Posted by yorkey View Post
    4 to the power of 3/2 * 2 to the power of negative 1/2
    .......but in the math workbook the answer is 2.
    IF answer is 2, then expression should be:
    2^(3/2) * 2^(-1/2)
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