Answer
$-\dfrac{1}{8}$
Work Step by Step
Using $a^{-n}=\dfrac{1}{a^n}$, the given expression, $
(-2)^{-3}
,$ simplifies to:
\begin{array}{l}\require{cancel}
\dfrac{1}{(-2)^{3}}
\\\\=
\dfrac{1}{-8}
\\\\=
-\dfrac{1}{8}
\end{array}
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