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Efectuati (2 radical din 2+1) la 2=

Răspuns :

[tex](2 \sqrt{2+1}) ^{2} =(2 \sqrt{3} ) ^{2} =4*3=12[/tex]
[tex](2 \sqrt{2} +1)^2=(2 \sqrt{2} )^2+2 \cdot 2 \sqrt{2} \cdot 1+1^2=8+4 \sqrt{2} +1=9+4 \sqrt{2} [/tex]