Answer
$3a^2-27a$
Work Step by Step
Using $a(b+c)=ab+ac$ or the Distributive Property, the given expression, $
(a-9)3a
$, is equivalent to
\begin{array}{l}\require{cancel}
3a(a-9)
\\\\=
3a(a)+3a(-9)
\\\\=
3a^2-27a
.\end{array}
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