matlab thks

Estimate the first derivative of f(x) = -0.1x4 -0.15x! -0.5x2 -0.25x + 1.2 at x = 0.5 using finite differences and a step size h = 0.25. Employ the o(h) and 0(h) forward and backward difference formulas, and the 0(h) and (h) centered difference formulas. Compute the absolute relative true error (in percent)