Elementary Algebra

Published by Cengage Learning
ISBN 10: 1285194055
ISBN 13: 978-1-28519-405-9

Chapter 11 - Additional Topics - 11.4 - Complex Numbers - Problem Set 11.4: 55

Answer

The answer is below.

Work Step by Step

Complex numbers are "complex" because they contain multiple types of numbers--real numbers and imaginary numbers. After all, when we add 1 and $2i$, we are adding a real and an imaginary number. Thus, real numbers are a subset of imaginary numbers as they are included in the set of imaginary numbers.
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