## Intermediate Algebra (12th Edition)

$-12a^4-3a^5$
Using $a(b+c)=ab+ac$ or the Distributive Property, the product of the given expression, $-3a^4(4+a) ,$ is \begin{array}{l}\require{cancel} -3a^4(4)-3a^4(a) \\\\= -12a^4-3a^5 .\end{array}