TeX source:
\begin{array}{crclcl} & \mathbb{D} &=& \mathbb{R} \cr \cr & 2x^3-x^2+6x &=& 3x^2 &\vert& -3x^2 \cr & 2x^3-4x^2+6x &=& 0 \cr & x\left(2x^2-4x+6\right) &=& 0 & \vert & \text{Satz vom Nullprodukt} \cr \text{Faktor 1:} & x_1 &=& 0 \cr\cr \text{Faktor 2:} & 2x^2-4x+6 &=& 0 & \vert & :2 \cr & x^2-2x+3 &=& 0 &\vert& \text{p-q-Formel} \cr & x_{2,3} &=& 1 \pm \sqrt{(-1)^2-3} \cr & &=& 1 \pm \sqrt{-2} \end{array}