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: 50

Answer

$21+20i$

Work Step by Step

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