Answer
$x= \pm 3i$
Work Step by Step
Given \begin{equation}
x^2+9=0.
\end{equation} Solve for $x$. \begin{equation}
\begin{aligned}
x^2+9&=0\\
x^2 &=-9\\
x&= \pm\sqrt{-9}\\
&= \pm 3i.
\end{aligned}
\end{equation} The solution is $x= \pm 3i$.
Intermediate Algebra: Connecting Concepts through Application
by Clark, Mark; Anfinson, Cynthia
Published by
Brooks Cole
ISBN 10:
0-53449-636-9
ISBN 13:
978-0-53449-636-4
Chapter 1-8 - Cumulative Review - Page 681: 107
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