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x²+7x+12.......(x+4)(x+3)
Eliminamos términos semejantes...
(x+1)
------
(x+4)
Aplicamos regla del aspa simple.
x² + 4x + 3
x + 3
x - 1
(x + 3) (x - 1) = 0
................................................................
x² + 7x + 12
x + 4
x + 3
(x + 4) (x + 3) = 0
.....................................................
Respuesta.