[tex]2 {x}^{2} = \frac{25}{2} [/tex] (inmultesti pe diagonala)
[tex]4 {x}^{2} = 25[/tex]
[tex] {x}^{2} = \frac{25}{4} [/tex]
[tex]x = \sqrt{ \frac{25}{4} } [/tex]
[tex]x = \frac{ \sqrt{25} }{ \sqrt{4} } [/tex]
[tex]x = \frac{5}{2} [/tex]
x=-5/2
(-5/2)^2=25/4
x={5/2; -5/2}
Coroana? :))
