Precalculus (6th Edition)

Published by Pearson
ISBN 10: 013421742X
ISBN 13: 978-0-13421-742-0

Chapter 1 - Equations and Inequalities - 1.3 Complex Numbers - 1.3 Exercises: 60

Answer

$ 4i + 3$

Work Step by Step

$(2+i)^2 = 2^2 + 2\times 2 \times i + i^2 = 4 + 4i + (-1) = 4i + 3$
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