Найдите координаты центра и радиус окружности по образцу: х^2+у^2-6х+8у+9=0
Х^2-2*3*х+(9-9)+у^2+2*4*у+(16-16)+9=0
х^2-2*3*х+9-9+у^2+2*4*у+16-16+9=0
(х-3)^2+(у+4)^2=-9+9+16
(Х-3)^2+(у+4)^2=16
(Х-3)^2+(у-4)^2=4^2
О(3;4) центр окружности
R=4
1. Х^2+у^2+3х-4у=0
2. Х^2+у^2-х-у-3=0
3. Х^2+у^2-8х+7=0
4. Х^2+у^2+8х+6у-20=0
5. Х^2+х^2-4х+6у-3=0
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