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Factorizacion.
Caso .
Diferencia de cuadrados.
a² - b² = (a + b)(a - b)
9 - (x + 4)²
3² - (x + 4)² =
(3 + x + 4)(3 - (x + 4)) =
(x + 7)(3 - x - 4) =
(x + 7)( - x - 1)
Respuesta.
(x + 7)( -x - 1)