f(x) = x^3 - 2·x^2 + 3
f'(x) = 3·x^2 - 4·x
t(x) = f'(1.5) * (x - 1.5) + f(1.5) = 0.75·x + 0.75
n(x) = -1 / f'(1.5) * (x - 1.5) + f(1.5) = 31/8 - 4/3·x
Strecke auf der y-Achse
31/8 - 0.75 = 25/8 = 3.125
Skizze
~plot~ x^3-2x^2+3;0.75x+0.75;31/8-4/3*x;[[-4|4|-1|5]] ~plot~