TeX Quellcode:

\begin{array}{crclcl} & \sqrt{x^4-x^2+9} &=& 3 &\vert& ()^2 \cr & x^4-x^2+9 &=& 9 &\vert& -9 \cr & x^4-x^2 &=& 0 \cr & x^2 \cdot (x^2-1) &=& 0 & \vert & \text{Satz vom Nullprodukt} \cr \cr \text{Faktor 1:} & x_1 &=& 0\;\in\;\mathbb{D} \cr\cr \text{Faktor 2:} & x^2-1 &=& 0 & \vert & +1 \cr & x^2 &=& 1 &\vert& \pm \sqrt{} \cr\cr & x_2 &=& 1\;\in\;\mathbb{D} \cr & x_3 &=& -1\;\in\;\mathbb{D} \end{array}