TeX Quellcode:

\begin{array}{rclcl} x^2-\dfrac{7}{2}x+4 &=& 0 \cr x_{1,2} &=& \dfrac{7}{4} \pm\sqrt{\left(\dfrac{7}{4}\right)^2-4} \cr &=& \dfrac{7}{4} \pm\sqrt{-\dfrac{15}{16}} \end{array}