x2−8x+19=0x^{2}-8 x+19=0x2−8x+19=0
x2+8x+19=0x^{2}+8 x+19=0x2+8x+19=0
x2+8x+13=0x^{2}+8 x+13=0x2+8x+13=0
x2+8x−3=0x^{2}+8 x-3=0x2+8x−3=0