Algebra: A Combined Approach (4th Edition)

Published by Pearson
ISBN 10: 0321726391
ISBN 13: 978-0-32172-639-1

Chapter 11 - Section 11.2 - Solving Quadratic Equations by Completing the Square - Exercise Set - Page 776: 24


$x=-1\pm i$

Work Step by Step

$x^{2}+2x+2=0$ Use the quadratic formula to solve this equation. The formula is $x=\dfrac{-b\pm\sqrt{b^{2}-4ac}}{2a}$. Here, $a=1$, $b=2$ and $c=2$ Substitute: $x=\dfrac{-2\pm\sqrt{2^{2}-4(1)(2)}}{2(1)}=\dfrac{-2\pm\sqrt{4-8}}{2}=...$ $...=\dfrac{-2\pm\sqrt{-4}}{2}=\dfrac{-2\pm2i}{2}=-1\pm i$
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