Answer
$-6x^{2}y^2$
Work Step by Step
Using $x^a\cdot x^b=x^{a+b}$, the given expression, $
(-3xy)(2xy)
,$ simplifies to
\begin{array}{l}\require{cancel}
(-3)(2)x^{1+1}y^{1+1}
\\\\=
-6x^{2}y^2
.\end{array}
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