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[tex] x^{2} [/tex]+2x+1=3+2[tex]  \sqrt{2} [/tex]

Răspuns :

[tex]x^2+2x+1=3+2\sqrt{2}\\ (x+1)^2=(\sqrt{2}+1)^2\\ x+1=\sqrt{2}+1=\ \textgreater \ x=\sqrt{2}\\ x+1=-\sqrt{2}-1=\ \textgreater \ x=-\sqrt{2}-2[/tex]