You can put this solution on YOUR website! i have a problem of this question factorize it a3-13a+12.
**
f(a)= a3-13a+12
Use rational roots theorem to solve: (with synthetic division)
...0..|.....1......0......-13.......12............
...1..|.....1......1......-12........0 (1 is a root)
f(a)=(a-1)(a^2+a-12)
f(a)=(a-1)(a+4)(a-3)
(