Try factoring out .
2. Change the system to
Multiplying the second equation by 2 yields
Adding those two equations yields
Can you finish?
Sorry about ridiculous title, but i wasnt sure ....
1) it is given that (having large problems with the maths layout thing)
hence express as a product of 3 linear factors
The 0's are really throwing me on this one :S
The process I used for solving the first problem is known as long division of polynomials (and a little bit of factoring). For polynomials of degree 3 or greater, you will have to try dividing the polynomial by different factors using either this method or synthetic division, which is basically a symbolic representation of long division.