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x +2
x +1
2x+ x = 3x
(x+2)(x+1) = 0
x+2 = 0 x +1 = 0
x = -2 x = -1
CS= (-2; -1)
x² + 3x + 2 = 0 Factorizas
(x + 2)(x + 1) = 0 Tiene como solución dos raices reales
x + 2 = 0
x = - 2
o
x + 1 = 0
x = - 1
Solución.
(- 2 , - 1)