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 - Page 663: 51



Work Step by Step

$(3-7i)(3+7i)$ =$3(3+7i)-7i(3+7i)$ =$9+21i-21i-49i^{2}$ =$9+21i-21i-49(-1)$ =$9-49(-1)$ =$9+49$ =$58$
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