hip

$find \ all \ values \ of \ x \ using \ the \ cubic \ formula \sqrt[3]{\frac{-q}{2} + \sqrt{(\frac{q}{2})^2 + (\frac{p}{3})^3}} + \sqrt[3]{\frac{-q}{2} - \sqrt{(\frac{q}{2})^2 + (\frac{p}{3})^3}}$ of x^3 + x^2 + x + 1