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

$-12-18i$
Step 1: $-3i(6-4i)$ Step 2: $-18i+12i^{2}$ Step 3: Since $i^{2}=-1$, we substitute this value of $i^{2}$ into the expression Step 4: The expression becomes $-18i+12(-1)$ Step 5: Simplifying further, $-12-18i$