Posted by mateyo on .
factorise x^34x6211x+2

maths 
Reiny,
check your typing, I suspect a typo.

maths 
Steve,
x^34x6211x+2
since ^ is shift6, I suspect you meant:
x^34x^211x+2
cubics are not generally easy to solve, so look for easy integral roots first: ±1, ±2
A little synthetic division yields
(x+2)(x^26x+11)
Using the quadratic formula, you get
x = 3±2√2
so, the factorisation is
(x+2)(x32√2)(x3+2√2)