Answer
$-7$
Work Step by Step
RECALL:
$\ln{e^x} = x.$
Note that $\dfrac{1}{e^7}=e^{-7}$.
This means that the given expression can be written as
$\ln{e^{-7}}.$
Use the rule above to obtain
$\ln{e^{-7}} = -7.$
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 3.2 - Exponential Functions - Exercise Set - Page 464: 92
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