[tex] x^{2}= \frac{1}{2}=>x_{12}=±\sqrt{ \frac{1}{2}}= ±\frac{1}{ \sqrt{2}}=± \frac{ \sqrt{2}}{2} [/tex]
[tex] x_{1} = +\frac{ \sqrt{2}}{2} [/tex]
[tex] x_{2} = -\frac{ \sqrt{2}}{2} [/tex]
Caracterul  a aparut deoarece am folosit semnul "±", care a deranjat editorul de ecuatii.
