Answer
$$\boxed {(3n+4)(n+1)}$$
Work Step by Step
$$3n^2+7n+4$$
$$3n^2+3n+4n+4$$
$$3n(n+1)+4(n+1)$$
$$\boxed {(3n+4)(n+1)}$$
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.