Posted by **mateyo** on Wednesday, March 14, 2012 at 11:00am.

factorise x^3-4x62-11x+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^3-4x62-11x+2

since ^ is shift-6, I suspect you meant:

x^3-4x^2-11x+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^2-6x+11)

Using the quadratic formula, you get

x = 3±2√2

so, the factorisation is

(x+2)(x-3-2√2)(x-3+2√2)

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