x_{1, 2} = - \frac{b}{2 a} \pm \sqrt{\frac{b^{2}}{4 a^{2}} - \frac{c}{d}}

${x_{1, 2} = - \frac {b} {2a} \pm \sqrt {\frac {b^2} {4a^2} - \frac{c} {d}}}$