TeX Quellcode:

\begin{array}{rclll} f'(x) &=& \dfrac{-6x+8}{\sqrt{-6x^2+16x+1}} \cr \cr 0 &=& \dfrac{-6x+8}{\sqrt{-6x^2+16x+1}} \cr 0 &=& -6x+8 &\vert & +6x \cr 6x &=& 8 &\vert & :6 \cr \cr x &=& \dfrac{4}{3}\end{array}