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x^2 + y^2 -4x -10y + 25 = 0
cara cepat :
koefisien x jika : -2 harus = 2
koefisien y jika : -2 = 5
(2,5)
koef x = -4/-2 = 2
koef y = -10/-2 = 5
x2-4x+4+y2-10y+25-4=0
×2+y2-4x-10y+25=0