Answer
$x=-2 \pm\sqrt 5$
Work Step by Step
We are given
$x^2+4x=1$
$x^2+4x-1=0$
$x=\frac{-4 \pm \sqrt 4^2-4.1.(-1)}{2.1}$
$x=\frac{-4 \pm 2\sqrt 5}{2}$
$x=-2 \pm\sqrt 5$
Algebra 1: Common Core (15th Edition)
by Charles, Randall I.
Published by
Prentice Hall
ISBN 10:
0133281140
ISBN 13:
978-0-13328-114-9
Chapter 9 - Quadratic Functions and Equations - Chapter Test - Page 607: 16
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