## Elementary and Intermediate Algebra: Concepts & Applications (6th Edition)

$-15t^3-30t^2$
Using $a(b+c)=ab+ac$ or the Distributive Property, the given expression, $-5t^2(3t+6)$, is equivalent to \begin{array}{l}\require{cancel} -5t^2(3t)-5t^2(6) \\\\= -15t^3-30t^2 .\end{array}