Răspuns:
[tex]\bf{ x = \pm \: \frac{2 \sqrt{6} }{3} }[/tex]
Explicație pas cu pas:
[tex]\mathbf{(x {}^{2} - 2) \times 3 = 2}[/tex]
[tex]\mathbf{ {3x}^{2} - 2 \times 3 = 2 }[/tex]
[tex]\mathbf{3x {}^{2} - 6 = 2 \Longleftrightarrow3x {}^{2} = 2 + 6 = 8 }[/tex]
[tex]\mathbf{x {}^{2} = \frac{8}{3} \: \Longrightarrow \: x =\pm \sqrt{ \frac{8}{3} } = \pm \frac{2 \sqrt{6} }{3} }[/tex]
[tex]\boxed{ \bf{ S = \left\{ - \frac{2 \sqrt{6} }{3} ; \: \frac{2 \sqrt{6} }{3} \right\}}}[/tex]
Bafta ! :)
