Algebra 1: Common Core (15th Edition)

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

Answer

$x=-2 \pm\sqrt 5$

Work Step by Step

We are given $x^2+4x=1$ $x^2+4x-1=0$ $x=\frac{-4 \pm \sqrt 4^2-4.1.(-1)}{2.1}$ $x=\frac{-4 \pm 2\sqrt 5}{2}$ $x=-2 \pm\sqrt 5$
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