## Algebra: A Combined Approach (4th Edition)

$22-21i$
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: $22-21i$