Answer
$(-20)^{9}$
Work Step by Step
Using $(x^a)^b=x^{ab}$ or the power rule, the given expression, $
[(-20)^3]^3
,$ simplifies to
\begin{array}{l}\require{cancel}
(-20)^{3(3)}
\\\\=
(-20)^{9}
.\end{array}
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