ex 2,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
![Ex 2 class=](https://ro-static.z-dn.net/files/d6a/9866045675cf0a78dd8e0827013ac3d5.jpg)
[tex] \frac{x - 2}{x + 2} = (x - 2) \times (x + 2) = x^{2} - {2}^{2} = {x}^{2} - 4[/tex]