TeX Quellcode:
\begin{array}{rclcl}u_1 = z^4 &=& \dfrac{1+\sqrt{7}}{9} &\vert & \pm\sqrt[4]{} \\\\ z_{1,2} &=& \pm\sqrt[4]{\dfrac{1+\sqrt{7}}{9}} \approx \pm 0{,}80 \\\\ u_2 = z^4 &=& \dfrac{1-\sqrt{7}}{9} &\vert & \pm\sqrt[4]{}\\\\ z_{3,4} &=& \pm\sqrt[4]{\dfrac{1-\sqrt{7}}{9}}\end{array}