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fie x numar real , astfel incat x la puterea 16 = 2 . calculati (x+1)(x-1)(x la puterea 2 +1 )(x la puterea 4 +1 )(x la puterea 8 + 1 ).

Răspuns :

[tex]Aplicam formula: (a+b)(a-b)=a^2-b^2\\ (x+1)(x-1)(x^2+1)(x^4+1)(x^8+1)=\\ (x^2-1)(x^2+1)(x^4+1)(x^8+1)=(x^4-1)(x^4+1)(x^8+1)=\\ =(x^8-1)(x^8+1)=x^{16}-1=2-1=\boxed{1}[/tex]