Answer
$-30a^4b^4+36a^3b^2+36a^2b^3$
Work Step by Step
Using the Distributive Property, the given expression simplifies to
\begin{align*}
&
-6a^2b^2(5a^2b^2)-6a^2b^2(-6a)-6a^2b^2(-6b)
\\\\&=
-30a^4b^4+36a^3b^2+36a^2b^3
.\end{align*}
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