Answer
$22-21i$
Work Step by Step
Step 1: $(3-4i)(6+i)$
Step 2: Using FOIL, $3(6)+3(i)-4i(6)-4i(i)$.
Step 3: $18+3i-24i-4i^{2}$
Step 4: $18-21i-4i^{2}$
Step 5: Since $i^{2}=-1$,
$18-21i-4(-1)$.
Step 6: $18+4-21i$
Step 7: $22-21i$
Algebra: A Combined Approach (4th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321726391
ISBN 13:
978-0-32172-639-1
Chapter 10 - Section 10.7 - Complex Numbers - Practice - Page 736: 13
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