help witha 'rewrite and simplify' question - Math Help Forum

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#1

$Old$ December 4th, 2008, 08:38 AM

shiel8 $shiel8 is offline$

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$Default$ 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

$Old$ December 4th, 2008, 04:24 PM

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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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