Elementary and Intermediate Algebra: Concepts & Applications (6th Edition)

Published by Pearson
ISBN 10: 0-32184-874-8
ISBN 13: 978-0-32184-874-1

Chapter R - Elementary Algebra Review - R.4 Polynomials - R.4 Exercise Set: 57

Answer

$x^2-49$

Work Step by Step

Using $(a+b)(a-b)=a^2-b^2$ or the product of the sum and difference of like terms, the given expression, $ (x+7)(x-7) ,$ is equivalent to \begin{array}{l}\require{cancel} (x)^2-(7)^2 \\\\= x^2-49 .\end{array}
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