Answer
$10-10i$
Work Step by Step
Step 1: $(2-4i)(3+i)$
Step 2: $2(3+i)-4i(3+i)$
Step 3: $6+2i-12i-4i^{2}$
Step 4: $6+2i-12i-4(-1)$
Step 5: $6+4+2i-12i$
Step 6: $10-10i$
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: 58
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