Answer:
2i, -2i, -3, 3
Explanation:
We can complete the square to factor but make x to the power of 2 since the variable x is squared in the function aswell
Factor
(
+ 4)(
- 9)
Now we have two function we can set equal to 0
Find zeros
+ 4 = 0
- 9 = 0
= 9
= -4
x =

x =

±2i, ±3