College Algebra (11th Edition)

Published by Pearson
ISBN 10: 0321671791
ISBN 13: 978-0-32167-179-0

Chapter 1 - Section 1.3 - Complex Numbers - 1.3 Exercises: 15

Answer

Complex and pure imaginary.

Work Step by Step

Rewrite the radical. $\sqrt{25}=\sqrt{-1}\times\sqrt{25}=5i$ The number is complex because it takes on the form a+bi, a=0, and b=5, where a and b are both real numbers. The number is also purely imaginary because $a=0$.
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