Răspuns:
[tex] {x}^{2} = 2 + 8 + \sqrt{2 \times 8} = 10 + 4 = 16 \\ {x}^{2} = 16 \times 20 + 9 \times 45 - 12 \sqrt{20 \times 45 } = 320 + 405 - 360 = 365[/tex]
