Aici aplicam formula radicalilor compusi
[tex] \sqrt{3- \sqrt{5} } = \sqrt{ \frac{3+c}{2} } - \sqrt{ \frac{3-c}{2} }
unde c= \sqrt{ 3^{2}-5 } = \sqrt{4} =2
\sqrt{ \frac{3+2}{2} } - \sqrt{ \frac{3-2}{2} } = \frac{ \sqrt{5} }{ \sqrt{2} } - \frac{1}{ \sqrt{2} }
x= \sqrt{5} / \sqrt{2} -1/ \sqrt{2} + \sqrt{5} / \sqrt{2} +1/ \sqrt{2}
x=2 \sqrt{5} /2 \sqrt{2} [/tex]
