Answer
$16+20i$
Work Step by Step
$z_{3}(z_{1}+z_{2})$
=$(4+5i)[(2+3i)+(2-3i)]$
=$(4+5i)(2+2+3i-3i)$
=$(4+5i)(4)$
=$16+20i$
Trigonometry 7th Edition
by McKeague, Charles P.; Turner, Mark D.
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: 81
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