f(x) = x2·e-x
f'(x) = e-x·(2·x - x2)
f''(x) = e-x·(x2 - 4·x + 2)
Extremstellen f'(x) = 0
2·x - x2 = 0
x = 2 ∨ x = 0
f(0) = 0
f(2) = 4/e2 = 0.5413411329
Wendestellen f''(x) = 0
x2 - 4·x + 2 = 0
x = 2 ± √2
x = 3.414213562 ∨ x = 0.5857864376
f(3.414213562) = 0.3835369905
f(0.5857864376) = 0.1910182260
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