Answer
-1
Work Step by Step
$-x^{2}-2x-1=0$
$x=\frac{2\pm \sqrt (2^{2}-4(-1)(-1))}{-2}=\frac{2\pm \sqrt 0}{-2}=\frac{2}{-2}=-1$
Finite Math and Applied Calculus (6th Edition)
by Waner, Stefan; Costenoble, Steven
Published by
Brooks Cole
ISBN 10:
1133607705
ISBN 13:
978-1-13360-770-0
Chapter 0 - Section 0.5 - Solving Polynomial Equations - Exercises - Page 30: 19
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