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Descompunand in factori : x² -2x-3 = obtinem ?

Răspuns :

x² -2x-3=x² -3x+x-3=x(x-3)+(x-3)=(x+1)(x-3)


x²-3x+x-3=x(x-3)+(x-3)=  (x+1)(x-3)