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X^2 + 4 descompunere
X^2- x - 2


Răspuns :

x^2+4=x^2+4+4x-4x=(x+2)^2-4x=(x+2+2rad x)(x+2-2rad x)

x^2 - x -2= x^2+x-2x-2=x(x+1)-2(x+1)=(x+1)(x-2)