Răspuns:
2.
[tex]4 \sqrt{2} + 9 \sqrt{2} - 13 \sqrt{2} = 0[/tex]
[tex]2 + \sqrt{6} - 6 - \sqrt{6} = - 4[/tex]
3.
[tex] {x}^{2} - 7x + 5 - {x}^{2} - 7x + 8 = 13 - 14x[/tex]
[tex]4 {x}^{2} + 4x + 1 - 4 {x}^{2} + 4x - 1 = 8x[/tex]
4.
a)
[tex]x(x + 1) - (x + 1) = (x + 1)(x - 1)[/tex]
b)
[tex](x + 3)^{2} - {y}^{2} = (x + 3 - y)(x + 3 + y)[/tex]
