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descompuneti in factori E(x)= x^3 -2x^2-x+2

explicat va rog


Răspuns :

E(x)=x³-2x²-x+2

E(x)=x²•(x-2)-(x-2)

E(x)=(x-2)•(x²-1)

E(x)=(x-2)•(x-1)•(x+1)