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Solution :
method 2 x 2 y 2 2gx 2 fy c 0
Centre : (-5,-9), radius = 2 3 Center , C = ( - g , - f )
compare : Radius , r g f c
2
2
g 5 g 5
f 9 f 9
r g 2 f 2 c c g 2 f 2 r 2
2
2
5 9 2 ( ) 3 2
c 94
substitute into general equation :
x 2 y 2 2gx 2 fy c 0
x 2 y 2 ) 5 ( 2 x ) 9 ( 2 y 94 0
x 2 y 2 10 x 18 y 94 0