x2+y2−8x−16y+64=0x^{2}+y^{2}-8 x-16 y+64=0x2+y2−8x−16y+64=0
x2+y2−8x+16y+64=0x^{2}+y^{2}-8 x+16 y+64=0x2+y2−8x+16y+64=0
x2+y2−8x+16y+16=0x^{2}+y^{2}-8 x+16 y+16=0x2+y2−8x+16y+16=0
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