TeX Quellcode:
\begin{array}{rclll} \mathbb{D} &=& \mathbb{R} \cr\cr f'(x) &=& x^2+4x-12 \cr \cr 0 &=& x^2+4x-12 \cr x_{1,2} &=& -\dfrac{4}{2} \pm \sqrt{\left(-\dfrac{4}{2}\right)^2-(-12)} \cr x_{1,2} &=& -2 \pm \sqrt{16} \cr\cr x_1 &=& -2+4 \quad = \quad 2 \cr x_2 &=& -2-4 \quad = \quad -6\end{array}