Answer
$5x^3+30x^2$
Work Step by Step
Using $a(b+c)=ab+ac$ or the Distributive Property, the given expression, $
5x^2(x+6)
,$ is equivalent to
\begin{array}{l}\require{cancel}
5x^2(x)+5x^2(6)
\\\\=
5x^3+30x^2
.\end{array}
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