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Descompuneti in factori x la puterea a 2a -4x-5

Răspuns :

[tex]x^2-4x-5=(x^2-4x+4)-9=\\ =(x-2)^2-3^2=\\ =(x-2-3)(x-2+3)=\\ =(x-5)(x+1)[/tex]