Answer:
3
Step-by-step explanation:
Start by factoring the original equation
4x^2 - 4x - 120 =
4(x*2 - x - 30)
Then compare to each:
1. 2(2x^2 - 2x - 60) can be further factored: 4(x^2 - x - 30), so it works.
2. Correct also
3. 4(x+6)(x-5) = 4(x^2 + x - 30), so it does not work.
4. 4x(x - 1) - 120 = 4x^2 - 4x - 120, when factored it is 4(x^2 - x - 30) so it also works.
(3) I, II, and IV
