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: 77

Answer

$-7+22i$

Work Step by Step

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