x2−2x+3=0x^{2}-2 x+3=0x2−2x+3=0
x2−2x−3=0x^{2}-2 x-3=0x2−2x−3=0
x2−2x+1=0x^{2}-2 x+1=0x2−2x+1=0
x2−2x−1=0x^{2}-2 x-1=0x2−2x−1=0