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