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Descompuneti in factori :
x la a 2 - 5 x
x(x+1)-x-1


Răspuns :

x la a 2 - 5 x= x(x-5)
x(x+1)-(x-1) = x(x-1) la a 2
x² - 5x = x (x-5) ;
x(x+1) - x - 1 = x(x+1) - (x+1) = (x+1)(x-1) ;