Factor completely 3x2 - x - 4.

(3x - 1) (x + 4)

(3x + 4) (x - 1)

(3x - 2) (x + 2)

(3x - 4) (x + 1)

If you would like to factor completely 3 * x^2 - x - 4, you can do this using the following steps:

3 * x^2 - x - 4 = (3 * x - 4) * (x + 1) = (3x - 4) * (x + 1)

The correct result would be (3x - 4) * (x + 1).