#### Answer

$4$

#### Work Step by Step

$x^{-4}=\dfrac {1}{256}=\dfrac {1}{4^{4}}=4^{-4}\Rightarrow x=4$

Published by
Pearson

ISBN 10:
013421742X

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

$4$

$x^{-4}=\dfrac {1}{256}=\dfrac {1}{4^{4}}=4^{-4}\Rightarrow x=4$

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