TeX Quellcode:

\begin{array}{rclcl} 22+\sqrt{x^4+2x^2} &=& 23 &\vert& -22 \cr \sqrt{x^4+2x^2} &=& 1 &\vert& ()^2 \cr x^4+2x^2 &=& 1 &\vert& -1\cr \left(x^2\right)^2+2x^2-1 &=& 0 \end{array}