Answer
$ -18y^7$
Work Step by Step
We used: $y^n y^m = y^{n+m}$
$3(-6)y^{4+3} = -18y^7$
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.