Answer
$3$
Work Step by Step
$e^{6x}\times e^{x}=e^{21}\Rightarrow e^{7x}=e^{21}\Rightarrow 7x=21\Rightarrow x=\dfrac {21}{7}=3$
Precalculus (6th Edition)
by Lial, Margaret L.; Hornsby, John; Schneider, David I.; Daniels, Callie
Published by
Pearson
ISBN 10:
013421742X
ISBN 13:
978-0-13421-742-0
Chapter 4 - Inverse, Exponential, and Logarithmic Functions - Chapter 4 Test Prep - Review Exercises - Page 492: 47
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