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x²+4x+y²-6y-221=0
(x+2)²-4+(y-3)²-9-221=0
(x+2)²+(y-3)²=221+9+4
(x+2)²+(y-3)²=234
(x-x₁)²+(y-y₁)²=r²
S=(-2;3)
x²+4x+4+y²-6y+9-4-9-221=0
(x+2)²+(y-3)²=234
a=-2;b=3 więc środek okręgu ma współrzędne(-2,3)