Answer
$14t^3+7t^2$
Work Step by Step
Using $a(b+c)=ab+ac$ or the Distributive Property, the given expression, $
7t^2(2t+1)
$, is equivalent to
\begin{array}{l}\require{cancel}
7t^2(2t)+7t^2(1)
\\\\=
14t^3+7t^2
.\end{array}
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