Matlab programming.

Let S(x) be a quadratic spline that interpolates on the interval at 41 equally spaced nodes in the interval [-1,1]. Evaluate f(x)-S(x) at 200 equally spaced x values with x₁ = -1 and x₂₀₀ = 1 and plot the error f(x) - p(x). What are the maximum positive error? What are the maximun negative error?

f(a) (5a)2