TeX Quellcode:

\begin{array}{rclcl} -\left(5x^2+1\right)\cdot\left(x^2+20\right) & > & 0 \\-5x^4-101x^2-20 & > & 0 &\vert & :\left(-5\right) \\x^4+\dfrac{101}{5}x^2+4 & < & 0 \end{array}