Question

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

Answer 1

$(2 \sqrt{2+1}) ^{2} =(2 \sqrt{3} ) ^{2} =4*3=12$

Answer 2

$(2 \sqrt{2} +1)^2=(2 \sqrt{2} )^2+2 \cdot 2 \sqrt{2} \cdot 1+1^2=8+4 \sqrt{2} +1=9+4 \sqrt{2}$