f(x) = e^{-0,5x} ; P ( -2 / f(-2))
f(-2) = e = 2,7....
f ' (x) = - e^{-0,5x} / 2
f ' (-2) = - e / 2
Also Tangente y = - e / 2 * x + n
mit P e = - e / 2 * (-2) + n
e = e + n
n=0 also
y = - e / 2 * x
Normale hat Steigung m = -1 / ( - e / 2 ) = 2/e
also Gleichung y = 2/e * x + n
mit P e = 2/e * (-2) + n
n = 4,1898 Gleichung y = 0,7358 * x + 4,1898