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

Răspuns :

[tex](2x+1)^2-(x+1)^2=4x^2+1+4x-x^2-1-2x=3x^2+2x[/tex]
4x²+4x+1-x²-2x-1=3x²+2x