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x = - 4
x + 4 = 0
o
x = - 1
x + 1 = 0
(x + 4)(x + 1) = 0 Aplicas productos notables
(x + a)(x + b) = x² + (a + b)x + (a)(b)
x² + (4 + 1)x + (4 * 1) = 0
x² + 5x + 4 = 0
Respuesta.
x² + 5x + 4 = 0