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Let f(x) = x2 - 81. Find f-1(x).
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Let f(x) = x2 - 81. Find f-1(x).

User Tim Keating
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1 Answer

4 votes
This is equivalent to finding a function g in which
g(x^2-81)=x.

We simply reverse the actions of the initial function by adding 81 back and taking the square root. Therefore,
f^(-1)(x)=√(x+81).
User Keara
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