..………………………………………………………..

 class=

Răspuns :

[tex] \sqrt{18} = \sqrt{9 \times 2} = \sqrt{3 {}^{2} \times 2 } = 3 \sqrt{2} [/tex]

[tex] \sqrt{2} + 2x = \sqrt{18} \\ \\ \sqrt{2} + 2x = 3 \sqrt{2} \\ 2x = 3 \sqrt{2} - \sqrt{2} \\ 2x = 2 \sqrt{2} \\ x = 2 \sqrt{2} \div 2 \\ x = \sqrt{2} [/tex]