Answer
$\lim\limits_{x \to 4} \log_3 f(x)=2$
Work Step by Step
We are given $\lim\limits_{x \to 4}f(x)=9$
so $\lim\limits_{x \to 4} \log_3 f(x)$
$= \log_3 \lim\limits_{x \to 4}f(x)$
$= \log_39$
$=\log_3 3^2$
$=2\log_33$
$=2$
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