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 4 - Polynomials - Study Summary - Practice Exercises: 25

Answer

$25-9x^2$

Work Step by Step

RECALL: $(a+b)(a-b)=a^2-b^2$ Use the formula above with $a=5$ and $b=3x$ to obtain: $(5+3x)(5-3x) \\=5^2-(3x)^2 \\=25-9x^2$
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