Posted by mateyo on Wednesday, March 14, 2012 at 11:00am.
factorise x^34x6211x+2

maths  Reiny, Wednesday, March 14, 2012 at 11:04am
check your typing, I suspect a typo.

maths  Steve, Wednesday, March 14, 2012 at 2:38pm
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)
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