Intermediate Algebra: Connecting Concepts through Application

Published by Brooks Cole
ISBN 10: 0-53449-636-9
ISBN 13: 978-0-53449-636-4

Chapter 8 - Radical Functions - 8.5 Complex Numbers - 8.5 Exercises: 49

Answer

$-60+32i$

Work Step by Step

$(2+8i)(2+8i)$ $=2(2+8i)+8i(2+8i)$ $=4+16i+16i+64i^{2}$ $=4+32i+64(-1)$ $=4+32i-64$ $=-60+32i$
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