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x³+x²-4x-4 supra  x(x-1)-2


Răspuns :

la numarator x²*(x+1)-4*(x+1)=(x+1)*(x²-4)=(x+1)*(x-2)*(x+2)
la numitor x²-x-2=x²-2x+x-2=x*(x+1)-2*(x+1)=(x+1)*(x-2)
de aici simplifici (x+1)*(x-2) si iti da x+2