x^2-3x+2=0
D=9-4*2=9-8=1
x1=1
x2=2
x^2-x-2=0
D=1-4*1*(-2)=9
x1=-2
x^2-2x-3=0
D=4-4*(-3)=4+12=16
x1=3
x2= -1
x^2-3x-4=0
D=9-4*(-4)=9+16=25
x1=4
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x^2-3x+2=0
D=9-4*2=9-8=1
x1=1
x2=2
x^2-x-2=0
D=1-4*1*(-2)=9
x1=-2
x2=2
x^2-2x-3=0
D=4-4*(-3)=4+12=16
x1=3
x2= -1
x^2-3x-4=0
D=9-4*(-4)=9+16=25
x1=4
x2= -1