Answer
See below.
Work Step by Step
The set of numbers in the form of $a+bi$ are the complex numbers. If $b\ne0$ it is an imaginary number, if $b=0$, it is a real number.
Intermediate Algebra for College Students (7th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13417-894-7
ISBN 13:
978-0-13417-894-3
Chapter 7 - Section 7.7 - Complex Numbers - Concept and Vocabulary Check - Page 569: 3
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