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x²+y²-2ax-2by+a²+b²-r²=0
-2a=2⇒a=-1
-2b=-12⇒b=6
S(-1,6)
a²+b²-r²=-7
(-1)²+6²-r²=-7
1+36-r²=-7
-r²=-7-37
-r²=-44
r²=44
r=√44
(x+1)²+(y-6)²=44
S=(-1,6), r=√44=2√11
II sposob:
-2a=2
a=-1
-2b=-12
b=6
r²=1+6²-(-7)=44
r=2√11