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To find the inverse function to the given one, we have to solve the expression for x:
[tex]\begin{gathered} f(x)=(x-6)^2 \\ \sqrt{f(x)}=x-6 \\ \sqrt{f(x)}+6=x \end{gathered}[/tex]Now, change f(x) for x and x for f^-1(x) to obtain the inverse function:
[tex]f^{-1}(x)=\sqrt{x}+6[/tex]