Answer
$(x+9)(x-9)$
Work Step by Step
$x^2-81=x^2-9^2=(x+9)(x-9)$
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: 9
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