I feel pretty dumb posting this up, but here we go.
I don't know why, I just never seem to be able to find the right combination for these.
I know we're meant to type out a common factor, I can't spot it though :(
I.e. for ax + bx + ay + by = a (x + y) + b (x + y) -> (a + b)(x + y)
Anyone want to point out the obvious combination for me?