Answer
$45-4x^2$
Work Step by Step
Use the special product: sum and difference of same terms (see page 28):
$(3\sqrt 5+2x)(3\sqrt 5-2x)=(3\sqrt 5)^2-(2x)^2=3^2(\sqrt 5)^2-4x^2=9(5)-4x^2=45-4x^2$
Algebra and Trigonometry 10th Edition
by Larson, Ron
Published by
Cengage Learning
ISBN 10:
9781337271172
ISBN 13:
978-1-33727-117-2
Prerequisites - Review Exercises - Page 63: 72
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