Answer
$x=\pm2i$
Work Step by Step
We know that $\sqrt{-1}=i$. Thus here: $x^2+4=0\\x^2=-4\\\sqrt{x^2}=\sqrt{-4}\\x=\pm\sqrt{-4}=\pm2\sqrt{-1}=\pm2i$
College Algebra (10th Edition)
by Sullivan, Michael
Published by
Pearson
ISBN 10:
0321979478
ISBN 13:
978-0-32197-947-6
Chapter 1 - Section 1.3 - Complex Numbers; Quadratic Equations in the Complex Number System - 1.3 Assess Your Understanding - Page 112: 55
Update this answer!
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.
