#### Answer

-1

#### Work Step by Step

By the definition of $i$ shown on Page 485, we know that $\sqrt -1=i$ because $i^{2}=-1$.
Therefore, $i^{2}$ must be equal to -1.

Published by
Pearson

ISBN 10:
0321969359

ISBN 13:
978-0-32196-935-4

-1

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