f(x) = a·x^3 + b·x^2 + c·x + d
f(0) = 0 --> d = 0
f(2) = 4 --> 8·a + 4·b + 2·c + d = 4
f''(2) = 0 --> 12·a + 2·b = 0
f'(2) = 3 --> 12·a + 4·b + c = 3
Löse das Gleichungssystem und erhalte: a = -0.25 ∧ b = 1.5 ∧ c = 0 ∧ d = 0
f(x) = -0.25·x^3 + 1.5·x^2