a) Fałsz
[tex]2(1 + \sqrt{5} ) = 2 + 2 \sqrt{5} \approx 2 + 2 \times 2.23 \approx 2 + 4.46 \approx 6.46[/tex]
b) Prawda
[tex] {1}^{2} + {( \sqrt{5}) }^{2} = {x}^{2} \\ 1 + 5 = {x}^{2} \\ {x}^{2} = 6 \\ x = \sqrt{6} [/tex]
