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(x+3)^2+(y-2)^2 =4^2
x^2+6x+9+y^2-4y+4 = 16
x^2+y^2+6x-4y+13-16 = 0
x^2+y^2+6x-4y-3 = 0
a) (x-3)^2+(y-2)^2 =0
melalui titik (-4,1)
maka (-4-3)^2+(1-2)^2 = r*2
50 = r^2
(x-3)^2+(y-2)^2 = 50