Answer
$(3a+4)(3a-4)$
Work Step by Step
Since $a^{2}-b^{2}=(a+b)(a-b)$, $9a^{2}-16=(3a+4)(3a-4)$.
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.