Intermediate Algebra (6th Edition)

Published by Pearson
ISBN 10: 0321785045
ISBN 13: 978-0-32178-504-6

Chapter 5 - Review: 67

Answer

$15x^2+18xy-81y^2$

Work Step by Step

Using $(a+b)(c+d)=ac+ad+bc+bd$ or the FOIL Method, then, \begin{array}{l} (5x-9y)(3x+9y) \\= 15x^2+45xy-27xy-81y^2 \\= 15x^2+18xy-81y^2 .\end{array}
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