TeX source:
\begin{array}{rclcl}2x^2+20x+32 &=& 0 &\vert & :2 \\x^2+10x+16 &=& 0 &\vert & \text{p-q-Formel} \\x_{2,3} &=& -5\pm\sqrt{5^2-16} \\x_{2,3} &=& -5\pm\sqrt{9} \\\\x_2 &=& -5+3 = -2 \\x_3 &=& -5-3 = -8 \\\\\mathbb{L} &=& \left\{-8;-2;4\right\}\end{array}