I am searching for the approximate values for f'(x) at each of the x-values from the table.

Find approximate values for f (x) at each of the x-values given in the following table. Use a right-hand approximation where possible. If a right-hand approximation is not possible, use a left-hand approximation. X 0 2 4 6 8 f(x) 56 50 42 34 28 0 2 4 6 8 f' (x )