Answer
$6x^2+61xy+63y^2$
Work Step by Step
Use the FOIL method to evaluate the product as
$(x+9y)(6x+7y)=6x^2+7xy+54xy+63y^2=6x^2+61xy+63y^2$
Precalculus (6th Edition) Blitzer
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13446-914-3
ISBN 13:
978-0-13446-914-0
Chapter P - Section P.4 - Polynomials - Exercise Set - Page 56: 60
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