Trigonometry (10th Edition)

Published by Pearson
ISBN 10: 0321671775
ISBN 13: 978-0-32167-177-6

Chapter 8 - Complex Numbers, Polar Equations, and Parametric Equations - Section 8.1 Complex Numbers - 8.1 Exercises - Page 358: 68

Answer

$3+4i$

Work Step by Step

Step 1: $(2+i)^{2}$ Step 2: $(2+i)(2+ii)$ Step 3: $2(2+i)+i(2+i)$ Step 4: $4+2i+2i+i^{2}$ Step 5: $4+4i+(-1)$ Step 6: $4+4i-1$ Step 7: $3+4i$
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