Answer
$9a^4b^6$
Work Step by Step
Using $(cx^a)^b=c^bx^{ab}$, the given expression, $
(-3a^2b^3)^2
,$ simplifies to
\begin{array}{l}\require{cancel}
(-3)^2
a^{2(2)}b^{3(2)}
\\\\=
9a^4b^6
.\end{array}
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