Answer
$4a^2-28a$
Work Step by Step
Using $a(b+c)=ab+ac$ or the Distributive Property, the given expression, $
(a-7)4a
$, is equivalent to
\begin{array}{l}\require{cancel}
4a(a-7)
\\\\=
4a(a)+4a(-7)
\\\\=
4a^2-28a
.\end{array}
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