x2+2x+10=0x^{2}+2 x+10=0x2+2x+10=0
x2+6x+18=0x^{2}+6 x+18=0x2+6x+18=0
x2−2x+10=0x^{2}-2 x+10=0x2−2x+10=0
x2−6x+18=0x^{2}-6 x+18=0x2−6x+18=0