Answer
$1+\log_7{x}$
Work Step by Step
RECALL:
(i) $\log_b{MN}=\log_b{M} + \log_b{N}$ (Product Rule).
(ii) $\log_b{b}=1.$
Use the product rule with $M=7$ and $N=x$ to obtain
$\log_7{7} + \log_7{x}.$
Use rule (ii) above to obtain
$1+\log_7{x}.$
