Intermediate Algebra (12th Edition)

Published by Pearson
ISBN 10: 0321969359
ISBN 13: 978-0-32196-935-4

Chapter R - Test - Chapter R Test: 5

Answer

All numbers, except $\sqrt{-4}$.

Work Step by Step

All of the numbers are real, except $\sqrt{-4}$. This number is not real because square roots are only defined for positive numbers (i.e. $\sqrt{x}, x\geq0$).
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