Question

Solve 3x^2 = −12x − 15.

Answer 1

-2+i, -2-i are your two answers, you have to move everything to one side and solve

Answer 2

3x^2+12x+15=0


Then divide by 3 to get the x by itself. 
x^2+4x+5=0


Factor to (x+5) (x-1) and solve for the two values of x.