Precalculus (6th Edition) Blitzer

Published by Pearson
ISBN 10: 0-13446-914-3
ISBN 13: 978-0-13446-914-0

Chapter 2 - Section 2.1 - Complex Numbers - Exercise Set: 20

Answer

$ 21 -20i$

Work Step by Step

$(5-2i)^2$ $= 25 - 10i - 10i+ 4i^2$ $= 25-20i+ 4\times (-1)$ $= 25 - 4 -20i$ $= 21 -20i$
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