Answer
$72c^3d^3$
Work Step by Step
Using $x^a\cdot x^b=x^{a+b}$, the given expression, $
(6cd)(-3c^2d)(-4d)
,$ simplifies to
\begin{array}{l}\require{cancel}
(6)(-3)(-4)c^{1+2}d^{1+1+1}
\\\\=
72c^3d^3
.\end{array}
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