Raspuns :
[tex]x=\frac{(\sqrt{10}+2)(\sqrt{10}-2)}{\sqrt{6}} = \frac{10-4}{\sqrt{6}} = \frac{6}{\sqrt{6}} = \frac{6\sqrt{6}}{6}=\sqrt{6}[/tex]
Formule folosite :
- [tex]\frac{a}{b} =\frac{c}{d} => d=\frac{b*c}{a}[/tex], daca a,b,c,d sunt nenule
- [tex]a^{2} -b^{2} =(a-b)(a+b)[/tex]
