Intermediate Algebra: Connecting Concepts through Application

Published by Brooks Cole
ISBN 10: 0-53449-636-9
ISBN 13: 978-0-53449-636-4

Chapter 3 - Exponents, Polynomials and Functions - Chapter Review Exercises: 19

Answer

$15x^{2}-xy-28y^{2}$

Work Step by Step

$(3x+4y)(5x-7y)$ $=3x(5x-7y)+4y(5x-7y)$ $=15x^{2}-21xy+20xy-28y^{2}$ $=15x^{2}-xy-28y^{2}$
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