Answer
$\color{blue}{7q^3-9q^2-8q+9}$
Work Step by Step
Add by combining like terms to obtain:
$=(3q^3+4q^3) -9q^2-8q+(6+3)
\\=(3+4)q^3-9q^2-8q+9
\\=\color{blue}{7q^3-9q^2-8q+9}$
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.