Answer
$-i$
Work Step by Step
Using $i^2=-1$, the expression $
i^7
$ is equivalent to
\begin{array}{l}
i^6\cdot i
\\\\=
(i^2)^3\cdot i
\\\\=
(-1)^3\cdot i
\\\\=
-1\cdot i
\\\\=
-i
\end{array}
Intermediate Algebra (6th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321785045
ISBN 13:
978-0-32178-504-6
Chapter 10 - Cumulative Review - Page 634: 35a
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