Answer
$\ln{7x}$
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 $N=7$ to obtain
$\ln{(x\cdot 7)}
\\=\ln{7x}.$
Precalculus (6th Edition) Blitzer
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13446-914-3
ISBN 13:
978-0-13446-914-0
Chapter 3 - Section 3.3 - Properties of Logarithms - Exercise Set - Page 475: 43
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