Answer
$\sqrt {-1}$
Work Step by Step
According to the definition of an imaginary unit on page 734 of the book,
$i=\sqrt {-1}.$
Algebra: A Combined Approach (4th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321726391
ISBN 13:
978-0-32172-639-1
Chapter 10 - Section 10.7 - Complex Numbers - Vocabulary and Readiness Check - Page 739: 4
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