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Calculati:
(2x+1)² - (2x-1)²


Răspuns :

4x²+4x+1-4x²+4x-1=8x
[tex] (2x+1)^{2} - (2x-1)^{2} =\\=4 x^{2} +4x+1-(4 x^{2} -4x+1)=\\=4 x^{2} +4x+1-4 x^{2} +4x-1=8x[/tex]