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(a + b) = a² + 2ab + b²
(a - b)² = a² - 2ab + b²
(x + 3)² + (y - 5)² = 25
x² + 2(x)(3) + 3² + y² - 2(y)(5) + 5² = 25
x² + 6x + 9 + y² - 10y + 25 = 25
x² + 6x + y² - 10y + 9 + 25 - 25 = 0
x² + 6x + y² - 10y + 9 = 0
Respuesta.
x² + 6x + y² - 10y + 9 = 0