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