Descompunem dupa radacinile ecuatiilor atasate:
x1,2=-1+-rad(1+15)=-1+-4, -5 si 3
x3,4= -3 +-rad(9+72) : 2 = -3+-9 : 2, -6 si 3
F= (x+5)(x-3) / (x+6)(x-3) = (x+5)/(x+6), ∀x∉{-6;3}
