Answer
$-12a^4-3a^5$
Work Step by Step
Using $a(b+c)=ab+ac$ or the Distributive Property, the product of the given expression, $
-3a^4(4+a)
,$ is
\begin{array}{l}\require{cancel}
-3a^4(4)-3a^4(a)
\\\\=
-12a^4-3a^5
.\end{array}
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