Answer
$log_{4}9x$
Work Step by Step
We know that $log_{b}xy=log_{b}x+log_{b}y$ (where $x$, $y$, and $b$ are positive real numbers and $b\ne1$).
Therefore, $log_{4}9+log_{4}x=log_{4}(9\times x)=log_{4}9x$.
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