Answer
$-12y^2-20y$
Work Step by Step
Using $a(b+c)=ab+ac$ or the Distributive Property, the given expression, $
-4y(3y+5)
,$ is equivalent to
\begin{array}{l}\require{cancel}
-4y(3y)-4y(5)
\\\\=
-12y^2-20y
.\end{array}
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