So I have to do what it says in the title in order to continue to answer the rest of this question.

f(x) = x^2 - 4x - 3

And I need to express that in the form of a product of

(x-3)g(x)

I have no idea how to find g(x) so any hints would be much appreciated.

As an aside, I am aware it would be much easier if the question was x^2-4x+3, but I have double and triple checked my math to get up to this point and that is definitely not the question.