Answer
$4x^2+12x$
Work Step by Step
Using $a(b+c)=ab+ac$ or the Distributive Property, the given expression, $
4x(x+3)
,$ is equivalent to
\begin{array}{l}\require{cancel}
4x(x)+4x(3)
\\\\=
4x^2+12x
.\end{array}
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