factor 2x^3-2x^2-12 I used syntetic division to find a factor. remember that there is a 0x in the equation
2 | 2 -2 0 -12
| -4 12 12
|-----------------------------
2 -6 12 0
(x + 2)(2x^2 -6x + 12)
(x+2)2(x^2 - 3x + 6)
use quadratic equation to finish