x^2+5x+2-2x=0
x^2+3x+2=0
D=9-8=1
x1=(-3+1)/2*1=-2/2=-1
x2=(-3-1)/2*1=-4/2=-2
x1*x2=-1/9
x1+x2=-3/9=-1/3
=3*(-1/9)/(-1/3)=(-1/3)/(-1/3)=1