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: 78

Answer

$-7+22i$

Work Step by Step

$z_{3}z_{1}$ =$(4+5i)(2+3i)$ =$4(2+3i)+5i(2+3i)$ =$8+12i+10i+15i^{2}$ =$8+22i+15(-1)$ =$-7+22i$
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