Answer
$13$
Work Step by Step
$z_{2}z_{1}$
=$(2-3i)(2+3i)$
=$2(2+3i)-3i(2+3i)$
=$4+6i-6i-9i^{2}$
=$4-9(-1)$
=$4+9$
=$13$
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: 76
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