Answer
$-39a^4b^3$
Work Step by Step
Using $x^a\cdot x^b=x^{a+b}$, the given expression, $
(-3a^3b)(13ab^2)
,$ simplifies to
\begin{array}{l}\require{cancel}
(-3)(13)a^{3+1}b^{1+2}
\\\\=
-39a^4b^3
.\end{array}
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