Factorise fully the following:
a) x² + 3x
b) 2x? - 8x
c) 6x + 9x
d) 12x - 4x?
![Factorise fully the following a x 3x b 2x 8x c 6x 9x d 12x 4x class=](https://us-static.z-dn.net/files/d19/494115c4b29509f46257f9438d6c28b3.png)