Introductory Algebra for College Students (7th Edition)

$-12y^2-20y$
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}