Intermediate Algebra (6th Edition)

Published by Pearson
ISBN 10: 0321785045
ISBN 13: 978-0-32178-504-6

Chapter 7 - Section 7.7 - Complex Numbers - Exercise Set - Page 463: 64

Answer

$40$

Work Step by Step

Using $(a+b)(a-b)=a^2-b^2$ or the product of the sum and difference of like terms, the expression $ (6+2i)(6-2i) $ simplifies to \begin{array}{l} 6^2-(2i)^2 \\= 36-4i^2 \\= 36-4(-1) \\= 40 .\end{array}
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