Question

simplify.
(3 + 3i)3i
write your answer in the form a + bi.

Explanation:

Step1: Distribute $3i$ to terms

$ (3 + 3i)3i = 3\times3i + 3i\times3i $

Step2: Compute each product

$ = 9i + 9i^2 $

Step3: Substitute $i^2=-1$

$ = 9i + 9\times(-1) = -9 +9i $

Answer:

$-9 + 9i$