pre-cal

can anyone please explain to me how to simplify this exponential expression??I got no idea...THANKS A LOT!

[(-8x^6)/(y^-6)]^2/3

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  1. (-8 x^6 y^6)^2/3
    square everything to get rid of that pesky - sign
    (64 x^12 y^12 )^1/3
    now take the cube roots
    4 x^4 y^4

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