[tex]\frac{x^2}{2} =\frac{2+4}{2} \\\frac{x^2}{2} =\frac{6}{2} \\\frac{x^2}{2} =3|*3\\x^2=6\\x_1=\sqrt{6} \\x_2=-\sqrt{6}[/tex]
x^2/2 = (2+4)/2
x^2/2 =6/2
x^2/2 =3
x^2 = 6
x=±√6 → x=√6 și x2= -√6
