Answer
$\ln{3x}$
Work Step by Step
RECALL:
(i) $\log_b{M} + \log_b{N} = \log_b{MN}.$
(ii) $\log_b{b^x}=x.$
Use rule (i) above with $M=x$ and $N=3$ to obtain
$\ln{(x\cdot 3)}
\\=\ln{3x}.$
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