Let P be any real number and h be the step size of any interval. Then the relation between h and P for the backward difference is given by
Answer
x-x, = Ph
x- x, = P
x + x, = Ph
(x - x,)h= P

In the context of backward difference, the relationship between the step size h  and the point P can be expressed as:

x - x_n = Ph



Thus, the correct answer is x - x_n = Ph.

This expression indicates that the difference between a point  and a previous point x_n  can be represented as a multiple of the step size h .