Work Step by Step
Use the FOIL method to evaluate the product as $(x+9y)(6x+7y)=6x^2+7xy+54xy+63y^2=6x^2+61xy+63y^2$
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.