# How do you factor x^2 - 2x - x^4 + 1?

##### 1 Answer
Apr 20, 2016

${x}^{2} - 2 x + 1 - {x}^{4} = {\left(x - 1\right)}^{2} - {\left({x}^{2}\right)}^{2} = \left({x}^{2} + x - 1\right) \left(x - {x}^{2} - 1\right)$