Answer
$\dfrac{1}{49}$
Work Step by Step
Using $x^{-a}=\dfrac{1}{x^a}$the given expression, $
(-7)^{-2}
,$ simplifies to
\begin{array}{l}\require{cancel}
\dfrac{1}{(-7)^2}
\\\\=
\dfrac{1}{49}
.\end{array}
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