[tex]3 {x}^{2} = 10.8[/tex]
[tex]3 {x}^{2} = \frac{108}{10} [/tex]
[tex]3 {x}^{2} = \frac{54}{5} [/tex]
[tex] {x}^{2} = \frac{54}{5} \div 3[/tex]
[tex] {x}^{2} = \frac{54}{5} \times \frac{1}{3} [/tex]
[tex] {x}^{2} = \frac{54}{15} [/tex]
[tex] {x}^{2} = \frac{18}{5} [/tex]
[tex]x = \pm \sqrt{ \frac{18}{5} } [/tex]
[tex]x = \pm \frac{ \sqrt{18} }{ \sqrt{5} } [/tex]
[tex]x = \pm \frac{3 \sqrt{2} \times \sqrt{5} }{5} [/tex]
[tex]x =\pm \frac{3 \sqrt{10} }{5} [/tex]
