Answer
$f^{-1}(x) = 5^{x}$
Work Step by Step
$f(x) = \log_5 x$
Let $f(x) = y$
$y = \log_5 x$
Swap the variables $x$ and $y$ and then solve for $y$ to find the inverse:
$x = \log_5 y$
$5^{x} = y$
$f^{-1}(x) = 5^{x}$
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