a) x^3/(x^2-4)-x/(x-2)+2/(x+2)=0
x^2-4=(x-2)(x+2)
Aduci ecuatia la acelasi numitor.
x^3+(−x)(x+2)+2(x−2)=0
x^3−x^2−4=0
(x−2)(x^2+x+2)=0
x-2=0 => x=2 dar nu convine
x^2+x+2=0 => Δ<0 => x nu aparține lui ℝ (insa exista solutii in ℂ)
b) P(x)= 4x^3 + x^2 - 1
Q(x)= x^2 - 1
http://i.imgur.com/uYnuJ0M.png