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