Algebra 1: Common Core (15th Edition)

Published by Prentice Hall
ISBN 10: 0133281140
ISBN 13: 978-0-13328-114-9

Chapter 8 - Polynomials and Factoring - 8-4 Multiplying Soecial Cases - Practice and Problem-Solving Exercises - Page 509: 59



Work Step by Step

$(2x+5)(2x-5)=$ ...identify which terms correspond to $a $and $b $ in the rule for the product of a sum and difference ($(a+b)(a-b)=a^{2}-b^{2}$) $a=2x,\ b=5$...substitute for $a $and $b $ in the rule $(2x+5)(2x-5)=(2x)^{2}-(5)^{2}$...simplify. =$4x^{2}-25$ Answer: C.
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