[tex](2x + 1) {}^{2} - (2x - 1) {}^{2} - 2[/tex]
[tex](4x {}^{2} + 4x + 1) - (4x {}^{2} - 4x + 1) - 2[/tex]
[tex]4x {}^{2} + 4x + 1 - 4x {}^{2} + 4x - 1 - 2[/tex]
[tex]8x + 1 - 1 - 2[/tex]
[tex]8x - 2[/tex]
