1. The problem statement, all variables and given/known data 2. Relevant equations 3. The attempt at a solution The answer in the solutions is given as : (2x+1)(x-1)(1-x), they did their matrix differently so thats how they got that answer. I used wolfram alpha to factorise my quadratic on the last line and it gave me alternative forms which had 2 factors from the solutions provided to me, so my answer is correct. My issue is, how do I sort of convert my answer that I got into the ones that the solutions had as a lot of our exams are MCQ and I probably wouldn't have realized that they were the same answers.