Answer
$6x^4+8x^3$
Work Step by Step
Using $a(b+c)=ab+ac$ or the Distributive Property, the given expression, $
(3x^3+4x^2)(2x)
,$ is equivalent to
\begin{array}{l}\require{cancel}
(3x^3)(2x)+(4x^2)(2x)
\\\\=
6x^4+8x^3
.\end{array}
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