Question

aratati ca : (1+ radical din 2) la puterea 2 - 2rad din 2 =3

Answer 1

$(1+ \sqrt{2} ) ^{2} -2 \sqrt{2}=3 \ \textless \ =\ \textgreater \ 1+2 \sqrt{2}+2-2 \sqrt{2}=3 \ \textless \ =\ \textgreater \ 3=3$