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2. (x+3)(x+2)
3. (x+2)(x-1)
4. (x-4)(x-3)
x +2
x +1
(x+2)(x+1)=0
x= -2 ó x= -1
2.- x²+5x+6 (método del aspa)
x +3
x +2
(x+3)(x+2)=0
x= -3 ó x= -2
3.- x²+x-2 (aspas)
x -1
x +2
(x-1)(x+2)=0
x= 1 ó x= -2
4.- x²-7x+12 (aspas)
x -3
x -4
(x-3)(x-4)=0
x= 3 ó x= 4