Answer
$-24x^{5}y^{9}$
Work Step by Step
The product of the given expression, $
(-8x^3y^4)(3x^2y^5)
,$ is
\begin{array}{l}\require{cancel}
-8(3)x^{3+2}y^{4+5}
\\\\=
-24x^{5}y^{9}
.\end{array}
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