f(x) = (x-1)/(x-4)2 | Potenzregeln
= (x-1)*(x-4)-2 | Produktregel der Ableitung
f ' (x) = (x-1)* (-2)*(x-4)-3*1 + 1* (x-4)-2
= (x-1)* (-2)*(x-4)-3*1 + 1* (x-4)-2
= (-2x+2)/(x-4)3 + (x-4)/ (x-4)3 | Brüche addieren
= (-2x + 2 + x -4)/(x-4)3
= (-x - 2)/(x-4)3
= - (x+2)/(x-4)3