Algebra: A Combined Approach (4th Edition)

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

Chapter 11 - Review: 64


$x_{1}=\sqrt{7}i$ and $x_{2}=-\sqrt{7}i$

Work Step by Step

Given $x^2+7=0$ $a=1,\ b=0,\ c=7$ Using the quadratic formula: $\dfrac{-b\pm \sqrt{b^2-4ac}}{2a} , $ we have: $\dfrac{-0\pm \sqrt{0^2-4\times 1\times 7}}{2\times 1} = \dfrac{\pm \sqrt{-28}}{2} = \pm \dfrac{\sqrt{28}i}{2} = \pm \dfrac{2\sqrt{7}i}{2} = \pm \sqrt{7}i$ Therefore, the solutions are: $x_{1}=\sqrt{7}i$ and $x_{2}=-\sqrt{7}i$
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