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3x² +6x +3 saco factor comun 3
2(x² -1) 2(x +1) ( x -1) aplicamos diferencia de cuadrados a²-b²=(a+b)(a-b)
------------------ = ----------------------
3(x² +2x +1) 3( x +1)² factorizamos el trinomio al cuadrado perfecto
2 ( x +1)(x-1)
--------------------- simplificamos
3(x+1)(x+1)
2(x-1)
-------------- respuesta
3(x+1)