Solve by completing a square: 3x^2 - 4 =x
3x^2 - 4 = x
3x^2 - x = 4
multiply by 4 * 3 (where 3 is the coefft of x^2)
36x^2 - 12x = 48
(36x^2 - 12x + 1) - 1 = 48
(6x - 1)^2 - 1 = 48
(6x - 1)^2 = 49 = 7^2
6x - 1 = +/- 7
6x - 1 = -7, 6x - 1 = 7
6x = -6, 6x = 8
x = -1, x = 4/3