(x^2-3x+1)-3*(x^2-3x+1)=x-1 x^2-3x+1-3x^2+9x-3=x-1 -2x^2+6x-2=x-1 -2x^2+5x-1=0 2x^2-5x+1=0 D=b^2-4ac=25-8=17 x1,2=(-b±sqrt(D))/2a x1=(5+sqrt(17))/4 x2=(5-sqrt(17))/4