x2+y2+4x+14y=0x^{2}+y^{2}+4 x+14 y=0x2+y2+4x+14y=0
x2+y2+4x−14y=0x^{2}+y^{2}+4 x-14 y=0x2+y2+4x−14y=0
x2+y2−4x+14y=0x^{2}+y^{2}-4 x+14 y=0x2+y2−4x+14y=0
x2+y2−4x−14y=0x^{2}+y^{2}-4 x-14 y=0x2+y2−4x−14y=0