Answer
$(3x-1)(3x+1)$
Work Step by Step
By using the difference of two squares $x^2-a^2=(x-a)(x+a)$, we have
$$
9x^2 - 1=(3x-1)(3x+1)
.$$
Precalculus: Concepts Through Functions, A Unit Circle Approach to Trigonometry (3rd Edition)
by Sullivan III, Michael
Published by
Pearson
ISBN 10:
0-32193-104-1
ISBN 13:
978-0-32193-104-7
Appendix A - Review - A.4 Factoring Polynomials - A.4 Assess Your Understanding - Page A40: 18
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