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Răspuns:
Explicație pas cu pas:
3x²+2x-1= x²+(2x²+2x)-1= x²-1 +2x²+2x= (x+1)·(x-1)+2x(x+1)= (x+1)·[x-1+2x]=
=(x+1)·(3x-1) =(3x-1)·(x+1)