#### Answer

$\sqrt{-1}$;
$-1$

#### Work Step by Step

RECALL:
(1) $i = \sqrt{-1}$
(2) $i^2=-1$
Thus, the missing expressions in the given statement are $\sqrt{-1}$ and $-1$, respectively.

Published by
Pearson

ISBN 10:
0-13446-914-3

ISBN 13:
978-0-13446-914-0

$\sqrt{-1}$;
$-1$

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