TeX Quellcode:
\begin{array}{crclcl} & 0 &=& -\dfrac{1}{4}a^2+a \cr & 0 &=& a \left(-\dfrac{1}{4}a+1\right) & \vert & \text{Satz vom Nullprodukt} \cr\cr \text{Faktor 1:} & a_1 &=& 0 \cr\cr \text{Faktor 2:} & 0 &=& -\dfrac{1}{4}a_2+1 &\vert& -1 \cr & -1 &=& -\dfrac{1}{4}a_2 &\vert& : \left(-\dfrac{1}{4}\right) \cr & a_2 &=& 4 \end{array}