Algebra: A Combined Approach (4th Edition)

Published by Pearson
ISBN 10: 0321726391
ISBN 13: 978-0-32172-639-1

Chapter 10 - Section 10.7 - Complex Numbers - Exercise Set: 78

Answer

$-i$

Work Step by Step

$i^{-9} = (i^9)^{-1} = ((i^4)^2) * i)^{-1} = (1^2 * i)^{-1} = i ^ {-1} = -i$
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