x2−2x−2=0x^{2}-2 x-2=0x2−2x−2=0
x2+2x−2=0x^{2}+2 x-2=0x2+2x−2=0
x2−23x+2=0x^{2}-2 \sqrt{3} x+2=0x2−23x+2=0
x2+23x+2=0x^{2}+2 \sqrt{3} x+2=0x2+23x+2=0