Explicación paso a paso:
x^2 -8x + y^2 - 18y = - 16
x^2 -8x + 4^2 + y^2 - 18y + 9^2 = - 16 + 4^2 + 9^2
(x-4)^2 + (y-9)^2 = 81
Centro= (4 , 9)
Radio= 9
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Explicación paso a paso:
x^2 -8x + y^2 - 18y = - 16
x^2 -8x + 4^2 + y^2 - 18y + 9^2 = - 16 + 4^2 + 9^2
(x-4)^2 + (y-9)^2 = 81
Centro= (4 , 9)
Radio= 9