#### Answer

$3$

#### Work Step by Step

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

Published by
Pearson

ISBN 10:
013421742X

ISBN 13:
978-0-13421-742-0

$3$

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

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