## Intermediate Algebra (6th Edition)

$-6y^{4}z^{3n}+3yz^n$
Using $a(b+c)=ab+ac$ or the Distributive Property and using the laws of exponents, the given expression, $-3yz^n(2y^3z^{2n}-1)$, simplifies to \begin{array}{l}\require{cancel} -6y^{1+3}z^{n+2n}+3yz^n \\\\= -6y^{4}z^{3n}+3yz^n .\end{array}