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Thread: help witha 'rewrite and simplify' question

  1. December 4th 2008, 07:38 AM #1
    shiel8
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    help witha 'rewrite and simplify' question

    (\sqrt{x^-5} + x^-5y^7x^-2) + (x^9y^-2x^9)

    I am not sure how to deal with the root in there.
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  2. December 4th 2008, 03:24 PM #2
    nzmathman
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    Any number squarerooted: \sqrt{n} = n^{1/2}

    (\sqrt{x^{-5}} + x^{-5} y^7 x^{-2}) + (x^9 y^{-2} x^9)

    = (x^{-5/2} + x^{(-5-2)} y^7) + x^{(9+9)} y^{-2}

    = x^{-5/2} + x^{-7} y^7 + x^{18} y^{-2}
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