Question 586039
Use the idea that {{{x^(-n) = 1/(x^n)}}} where 'n' is some positive number to get 


<img src="http://latex.codecogs.com/gif.latex?\LARGE x^{-4}=\frac{1}{x^4}" title="\LARGE x^{-4}=\frac{1}{x^4}" />

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