Trigonometry (10th Edition)

Published by Pearson
ISBN 10: 0321671775
ISBN 13: 978-0-32167-177-6

Chapter 8 - Complex Numbers, Polar Equations, and Parametric Equations - Section 8.1 Complex Numbers - 8.1 Exercises - Page 357: 14


real, complex

Work Step by Step

Since $\sqrt (24)$ is an irrational number and irrational numbers are a subset of the set of real numbers, $\sqrt (24)$ can be labelled as a real number. For a complex number $a+bi$, if $b=0$, then $a+bi=a$, which is a real number. Thus, the set of real numbers is a subset of the set of complex numbers. Since $\sqrt (24)$ is a real number, it can also be labelled as a complex number.
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