## Precalculus (6th Edition)

$\color{blue}{7q^3-9q^2-8q+9}$
Add by combining like terms to obtain: $=(3q^3+4q^3) -9q^2-8q+(6+3) \\=(3+4)q^3-9q^2-8q+9 \\=\color{blue}{7q^3-9q^2-8q+9}$