I studied this for a while and I found I developed a question about c). I feel I understand whats being calculated at c to a good degree but I still wonder about why h(5) suddenly moves to the right when in the previous a) and b) the large h(+) is on the left. I see that in a) and b) this is done so the value of h() comes out as a negative. Why would then h(5) in c) be on the right? I calculated it and it works fine from what I can remember.

Thanks in advance...