Intermediate Algebra for College Students (7th Edition)

Published by Pearson
ISBN 10: 0-13417-894-7
ISBN 13: 978-0-13417-894-3

Chapter 7 - Section 7.7 - Complex Numbers - Exercise Set: 35

Answer

$-21 - 15i$

Work Step by Step

RECALL: (1) $a(b-c) = ac - bc$ (2) $i^2=-1$ Use rule (1) above to obtain: $=3i(7i) - 3i(5) \\=21i^2 - 15i$ Use rule (2) above to obtain: $=21(-1) - 15i \\=-21 - 15i$
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