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