How do you factor #x^3 - 2x^2 - x + 2# by grouping?
Using the identity:
The above method is an easy on to solve this question. For factorizing other cubic polynomials, the following method can be used:
First, by trial and error method, you can find one factor as follows:
When replacing 1,
So, we get
Then by long division, divide
Then you have to factorize it by splitting the middle term method.
~Hope this helps! :)