Question

Factor completely 3x^2-x-4
A. (3x-1)(x+4)
B.(3x+4)(x-1)
C.(3x-2)(x+2)
D.(3x-4)(x+1)

Answer 1

Hold on a second.

Answer 2

The answer is D @enelys

Answer 3

You need to learn the FOIL method of multiplying binomials mentally.

In particular, for this question multiply the first term of each binomial by the last term of the other and add these products. To see which answer choice will give you the correct linear term.