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: 38



Work Step by Step

RECALL: (1) $a(b-c) = ac - bc$ (2) $i^2=-1$ Use rule (1) above to obtain: $=-6i(3) - (-6i)(5i) \\=-18i - (-30i^2) \\=-18i+30i^2$ Use rule (2) above to obtain: $=-18i +30(-1) \\=-18i + (-30) \\=-30-18i$
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