# How do you simplify (x^2 - 1) / (1 -x^3)?

$\frac{{x}^{2} - 1}{1 - {x}^{3}} = \frac{\left(x - 1\right) \left(x + 1\right)}{\left(1 - x\right) \left({x}^{2} + x + 1\right)} =$
$= \frac{x + 1}{-} \left({x}^{2} + x + 1\right)$