- TeX source:
- \begin{array}{rclcl} u_1 = x^2 &=& -1+\sqrt{2} &\vert& \pm\sqrt{} \cr x_1 &=& \sqrt{-1+\sqrt{2}}\approx 0{,}64\;\in\;\mathbb{D} \cr x_2 &=& -\sqrt{-1+\sqrt{2}}\approx -0{,}64\;\in\;\mathbb{D} \cr\cr u_2 = x^2 &=& -1-\sqrt{2} &\vert& \pm\sqrt{} \cr x_3 &=& \sqrt{-1-\sqrt{2}} \cr x_4 &=& -\sqrt{-1-\sqrt{2}} \end{array}