Answer
$7x^2+38xy+15y^2$
Work Step by Step
Evaluate the product using FOIL as
$(x+5y)(7x+3y)=7x^2+3xy+35xy+15y^2=7x^2+38xy+15y^2$
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: 59
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