mai intai prelucram x patrat-x-2= x patrat+x-2x-2 = x(x+1)- 2(x+1) = (x+1)(x-2)
amplificam fractia 2 supra x-2 cu x+2 si fractia x supra x+2 cu x-2
e(x) = 2(x+2)+x(x-2) totul supra (x-2)(x+2) *(x+1)(x-2) supra x patrat +4
e(x) = 2x+4+x patrat-2x supra x patrat-4 *(x+1)(x-2) supra x patrat +4
e(x) = x patrat +4 supra (x-2)(x+2) * (x+1)(x-2) supra x patrat +4
e(x)= x+1 supra x-2