Răspuns:
[tex]$\mathbf{x = \pm \frac{4 \sqrt{2} }{5} }$[/tex]
Explicatie pas cu pas:
[tex]$\mathbf{25x {}^{2} - 32 = 0 }$[/tex]
[tex]$\mathbf{ {25x}^{2} = 0 + 32 < = > 25 {x}^{2} = 32 }$[/tex]
[tex]$\mathbf{ {x}^{2} = \frac{36}{25} }$[/tex]
[tex]$\mathbf{x =\pm \sqrt{ \frac{32}{25} } < = > x =\pm \frac{4 \sqrt{2} }{5} }$[/tex]
[tex]$\mathbf{\Longrightarrow \: S = \left\{ - \frac{4 \sqrt{2} }{5}; \frac{4 \sqrt{2} }{5} \right\}}$[/tex]
Bafta!
