Answer
$(3x+1)(3x-1)$
Work Step by Step
We can use the rule $(a+b)(a-b)=a^2-b^2$ because both terms, $9x^2$ and 1 are perfect squares. $9x^2-1=(3x+1)(3x-1)$
Algebra 2 Common Core
by Hall, Prentice
Published by
Prentice Hall
ISBN 10:
0133186024
ISBN 13:
978-0-13318-602-4
Chapter 4 - Quadratic Functions and Equations - 4-4 Factoring Quadratic Expressions - Practice and Problem-Solving Exercises - Page 222: 58
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