x^4-2x^3-6x^2+6x+9=0 x^4-2x^3-3x^2-3x^2+6x+9=0 x^2(x^2-2x-3)-3(x^2-2x-3)=0(x^2-2x-3)(x^2-3)=0(x-3)(x+1)(x+√3)(x-√3)=0
