#### Answer

$-4$

#### Work Step by Step

$x=\log _{3}\left( \dfrac {1}{81}\right) \Rightarrow 3^{x}=\dfrac {1}{81}\Rightarrow 3^{x}=3^{-4}\Rightarrow x=-4$

Published by
Pearson

ISBN 10:
013421742X

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

$-4$

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