Answer
$9(2x-1)(2x+1) $
Work Step by Step
By using the difference of two squares $a^2-b^2=(a-b)(a+b)$, we have $$ 36x^2 - 9=(6x-3)(6x+3)=3(2x-1)(3)(2x+1)\\
=9(2x-1)(2x+1) .$$
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: 22
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