f'

X1_{1} = NaN
f1(x) = ((-1 / 8 * x) * (x - 8))
f0(x) = Integral[f1] + 2
f(x) = If[0 ≤ x ≤ 10, f0(x)]
h(x) = If[¬(0 ≤ x ≤ 10), f0(x)]
a: f(8)
b: f1(4)