Answer
$\frac{-9+\sqrt7}{74}$
Work Step by Step
$\frac{-1}{9+\sqrt7}=\frac{-1(9-\sqrt7)}{(9+\sqrt7)(9-\sqrt7)}=\frac{-9+\sqrt7}{9^2-(\sqrt7)^2}=\frac{-9+\sqrt7}{81-7}=\frac{-9+\sqrt7}{74}$
Algebra 2 (1st Edition)
by Larson, Ron; Boswell, Laurie; Kanold, Timothy D.; Stiff, Lee
Published by
McDougal Littell
ISBN 10:
0618595414
ISBN 13:
978-0-61859-541-9
Chapter 4 Quadratic Functions and Factoring - 4.5 Solve Quadratic Equations by Finding Square Roots - Guided Practice for Examples 2, 3 and 4 - Page 268: 15
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