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x² + y² - 6x + 10y + 20 = 0
(x² - 6x ) + (y² - 10y) = - 20 Completando trinomios al cuadrado perfecto
(x² - 6x + 9) + (y² + 10y + 25) = - 20 + 9 + 25
(x - 3)² + (y + 5)² = 14
Ecuación de la circunferencia
(x - h)² + (y - k)² = r²
(x - 3)² + (y + 5)² = 14
Radio
r² = 14
r = √14
Centro =
(3 , -5)
Respuesta.
El radio = √14
El centro (3 , - 5)