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Descompuneti in factori:

x la puterea a doua - xy - y - 1


Răspuns :

[tex]x^2-xy-y-1 = x^2-1-xy-y = (x-1)(x+1)-y(x+1)= \\ = (x+1)(x-1-y) = (x+1)(x-y-1)[/tex]