Answer:
3(x + 4)
-----------------
(x - 4)(x - 1)
Step-by-step explanation:
In problems of this type, factoring is the first step. Once you have the factors, your next step is to reduce wherever possible.
3x + 12 3(x + 4)
----------------- = -----------------
x^2 - 5x + 4 (x - 4)(x - 1)
Unfortunately, none of these factors are cancellable. This factored form is as far as we can go.
