Work Step by Step
$30r^3+51r^2+9r$ $=3r(10r^2+17r+3)$ $=3r(10r^2+15r+2r+3)$ $=3r[5r(2r+3)+(2r+3)]$ $=3r(5r+1)(2r+3)$
You can help us out by revising, improving and updating this answer.Update this answer
After 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.