Trigonometry 7th Edition

Published by Cengage Learning
ISBN 10: 1111826854
ISBN 13: 978-1-11182-685-7

Chapter 8 - Section 8.1 - Complex Numbers - 8.1 Problem Set - Page 426: 75



Work Step by Step

$z_{1}= 2+3i$ $z_{2}= 2-3i$ use complex arithmetic rule $(a+bi)(a-bi)=a^2+b^2$ $a=2$ $b=3$ $=2^2+3^2$ $13$
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