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descompuneti in factori[tex] (x+1)^{2} - (x-2)^{2} [/tex]

Răspuns :

x² + 2x + 1 - (x² - 4x + 4) = 
x² + 2x + 1 - x² + 4x - 4 =
6x - 3 =
3(2x - 1)