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If xy 0 and x -y, =

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GRE 1: Q167 V156
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If xy 0 and x -y, = [#permalink] New post 19 May 2018, 15:13
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If \(xy \neq 0\) and \(x \neq -y\),\(\frac{x^{36}-y^{36}}{(x^{18}+y^{18})(x^{9}+y^{9})}\) =

(A) \(1\)
(B) \(x^2 - y^2\)
(C) \(x^9 - y^9\)
(D) \(x^{18} - y^{18}\)
(E) \(\frac{1}{x^9 - y^9}\)
[Reveal] Spoiler: OA

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Re: If xy 0 and x -y, = [#permalink] New post 21 May 2018, 21:24
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(a+b)*(a-b)= a^2-b^2.
Using this formula to further solve the above equation leaves us with option C
Re: If xy 0 and x -y, =   [#permalink] 21 May 2018, 21:24
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