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OpenStudy (anonymous):
Find the inverse function of f. f(x) = 81/x^2 , x > 0 f −1(x) = ?
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OpenStudy (ranga):
Write the function as y = 81/x^2 interchange x and y. That is, replace x with y and y with x. Solve for y and put f^(-1)(x) in the place of y and that will be your inverse.
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