Answer
$\ln\frac{1}{2}=-4x$
Work Step by Step
$e^{-4x}=\frac{1}{2}$
$\ln e^{-4x}=\ln\frac{1}{2}$ (using the Inverse Property, page 375):
$-4x=\ln\frac{1}{2}$
Algebra and Trigonometry 10th Edition
by Larson, Ron
Published by
Cengage Learning
ISBN 10:
9781337271172
ISBN 13:
978-1-33727-117-2
Chapter 5 - 5.2 - Logarithmic Functions and Their Graphs - 5.2 Exercises - Page 379: 55
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