Algebra: A Combined Approach (4th Edition)

Published by Pearson
ISBN 10: 0321726391
ISBN 13: 978-0-32172-639-1

Chapter 10 - Section 10.7 - Complex Numbers - Practice: 13

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: $22-21i$
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