TeX source:
\begin{array}{crclcl} & -9u^2+45u &=& 0 \cr & 9u(-u+5) &=& 0 \cr \text{Faktor 1:} & u_1 &=& 0 \cr\cr \text{Faktor 2:} & -u+5 &=& 0 \cr & u_2 &=& 5\end{array}