#### Answer

$9$

#### Work Step by Step

$x=2^{\log _{2}9}\Rightarrow \log _{2}x=\log _{2}2^{\log _{2}9}\Rightarrow \log _{2}x=\log _{2}9\Rightarrow 2^{x}=2^{9}\Rightarrow x=9$

Published by
Pearson

ISBN 10:
013421742X

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

$9$

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