1. When \(a \ne 0\), there are two solutions to \(ax^2 + bx + c = 0\) and they are \[x = {-b \pm \sqrt{b^2-4ac} \over 2a}.\] 2. \[\frac{d \sqrt[2]{2x + 4} + x^{5}} {\sqrt[2]{2x + 4} + x^{5}}\]