x2+y2+10x−10y−25=0x^{2}+y^{2}+10 x-10 y-25=0x2+y2+10x−10y−25=0
x2+y2+10x+10y+25=0x^{2}+y^{2}+10 x+10 y+25=0x2+y2+10x+10y+25=0
x2+y2−10x+10y−25=0x^{2}+y^{2}-10 x+10 y-25=0x2+y2−10x+10y−25=0
x2+y2−10x−10y+25=0x^{2}+y^{2}-10 x-10 y+25=0x2+y2−10x−10y+25=0