The differences between the x-values and the y-values are
1) 12 & -12 = 0
2) -4 & 0 = 4
3) 0 & 7 = 7
4) 10 & 0 = -10
Since the question asks which must be A factor of p(x) or the y-value, I would advise to look for the answer that helps you receive one of the differences shown above. That said, I would go with <em>x - 10.</em>
