TeX Quellcode:

\begin{array}{rclll}1 &=& \sqrt[4]{x^2+4x}-1 &\vert & +1\cr 2 &=& \sqrt[4]{x^2+4x} &\vert & ()^4\cr 16 &=& x^2+4x &\vert & -16 \cr 0 &=& x^2+4x-16 &\vert& \text{p-q-Formel}\cr x_{1,2} &=& -2 \pm \sqrt{4+16}\cr\cr x_{1} &=&-2+\sqrt{20}\approx 2{,}47 \in\mathbb{D}\cr x_{2} &=&-2-\sqrt{20}\approx -6{,}47 \in\mathbb{D}\end{array}