(x^3/-27y^-6)^(-2/3)
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(x^3/-27y^-6)^(-2/3)

[From: ] [author: ] [Date: 12-07-06] [Hit: ]
......
The back of the book tells me that the answer is 9/(x^2y^4) but this does not seem right. i get 1/(-9x^2y^4) What am I doing wrong?

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The x's and y's are right, so I'll just deal with the constant.
(-1/27)^(-2/3) = (-27)^(2/3) = [(-27)^(1/3)]^2 = (-3)² = 9
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keywords: 27,(x^3/-27y^-6)^(-2/3)
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