I have a divided differences table and I have all my x values but I am missing one of my p(x). I need to find the first, second, and third differences for p(x) and I just am confused and do not know how to do it. The table looks like this....

x-value: -1 0 1 3 4

P(x): 3 -1 2 -2 ? (How do I find this value?)

p(x): ? ? ? ?

2p(x): ? ? ?

3p(x): ? ?

Please Help I'm so lost!!!