Răspuns:
E(x)=(2-8/(x+2)):(x²-4x+4)/(x²-4)=
[2(x+2)-8}]/(x+2):(x-2)²/(x²-4)=
(2x+4-8)/(x+2)*(x²-4)/(x-2)²=
(2x-4)/(x+2)*(x-2)(x+2)/(x-2)²=
2(x-2)*1/(x-2)=2
Explicație pas cu pas:
