x2+y2=10x^{2}+y^{2}=10x2+y2=10
x2+y2+10=0x^{2}+y^{2}+10=0x2+y2+10=0
x2+y2−100=0x^{2}+y^{2}-100=0x2+y2−100=0
(x−10)2+y2=100(x-10)^{2}+y^{2}=100(x−10)2+y2=100