Answer
$-28a^3b^2$
Work Step by Step
Using $x^a\cdot x^b=x^{a+b}$, the given expression, $
(-7ab)(-4a)(-ab)
,$ simplifies to
\begin{array}{l}\require{cancel}
(-7)(-4)(-1)a^{1+1+1}b^{1+1}
\\\\=
-28a^3b^2
.\end{array}
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