Sorry about ridiculous title, but i wasnt sure ....

1) it is given that $\displaystyle f(x)= xcubed+3xsquared-6x-8$ (having large problems with the maths layout thing)

hence express $\displaystyle f(x)$ as a product of 3 linear factors

2)Solve $\displaystyle 4a+2b+12=0 $and$\displaystyle a-b+3=0$

The 0's are really throwing me on this one :S