Precalculus (6th Edition)

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: 47

Answer

$3$

Work Step by Step

$e^{6x}\times e^{x}=e^{21}\Rightarrow e^{7x}=e^{21}\Rightarrow 7x=21\Rightarrow x=\dfrac {21}{7}=3$
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