Answer
$9(3+2z)(3-2z)$
Work Step by Step
$81-36z^2=9\times9-9\times4z^2=9(9-4z^2)=9[3^2-(2z)^2]=9(3+2z)(3-2z)$
Algebra and Trigonometry 10th Edition
by Larson, Ron
Published by
Cengage Learning
ISBN 10:
9781337271172
ISBN 13:
978-1-33727-117-2
Prerequisites - p.4 - Factoring Polynomials - Exercises - Page 39: 14
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