Answer:[tex]-36 + 48i+ 48i^{2}[/tex]
Step-by-step explanation:
1. Multiply -9 * 4 to get -36
2. Multiply -9 * -8i to get 72i
3. Multiply -6i * 4 to get -24i
4. Multiple -6i * -8i to get [tex]48i^{2}[/tex]
5. Combine terms to ger -36 + 72i - 24i + [tex]48i^{2}[/tex]
6. Combine like terms (72i and -24i) to get final answer:
[tex]-36 + 48i+ 48i^{2}[/tex]
