## Introductory Algebra for College Students (7th Edition)

$4y^4+8y^3$
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}