Answer
$\frac{1\pm\sqrt {5}}{2}$
Work Step by Step
Given $x^2-x-1=0$, we have $x=\frac{1\pm\sqrt {1+4}}{2}=\frac{1\pm\sqrt {5}}{2}$
Precalculus (10th Edition)
by Sullivan, Michael
Published by
Pearson
ISBN 10:
0-32197-907-9
ISBN 13:
978-0-32197-907-0
Chapter 7 - Analytic Trigonometry - 7.3 Trigonometric Equations - 7.3 Assess Your Understanding - Page 465: 4
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