2.
[tex](\sqrt{7}+\sqrt{2})^{2} = 7+2\sqrt{7\cdot2} + 2 = 9 + 2\sqrt{14} \ - \ P\\\\(\sqrt{5}+\sqrt{2})(\sqrt{5}-\sqrt{2}) = 5-2 = 3 \ - \ P[/tex]
3.
[tex]9a^{2}-6a+1 = (3a-1)^{2}=(1-3a)^{2}\\\\Odp. \ D.[/tex]
4.
[tex](3x-1)^{2}+1 = 9x^{2}-6x+1+1 = 9x^{2}-6x+2\\\\Odp. \ C.[/tex]
