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 - 3.2 Combining Functions - 3.2 Exercises - Page 244: 43



Work Step by Step

$(3x+7y)^{2}$ $=(3x+7y)(3x+7y)$ $=3x(3x+7y)+7y(3x+7y)$ $=9x^{2}+21xy+21xy+49y^{2}$ $=9x^{2}+42xy+49y^{2}$
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