[tex]a= \sqrt{2- \sqrt{2}} [/tex]
[tex]b= \sqrt{2+ \sqrt{2}} [/tex]
[tex] (a+b)^{2} =( \sqrt{2- \sqrt{2}}+ \sqrt{2+ \sqrt{2}})^{2} = [/tex]
[tex]=(2- \sqrt{2}) + 2 \sqrt{(2- \sqrt{2})(2+ \sqrt{2})}+(2+ \sqrt{2})= [/tex]
[tex]=4+ 2\sqrt{4-2} =4+2 \sqrt{2} [/tex]
=>raspuns corect punctul b)
