%% %% Ein Beispiel der DANTE-Edition %% Mathematiksatz mit LaTeX %% 3. Auflage %% Beispiel 10-04-4 auf Seite 218. %% Copyright (C) 2018 Herbert Voss %% %% It may be distributed and/or modified under the conditions %% of the LaTeX Project Public License, either version 1.3 %% of this license or (at your option) any later version. %% See http://www.latex-project.org/lppl.txt for details. %% %% ==== % Show page(s) 1 %% %% \documentclass[10pt]{screxa} \pagestyle{empty} \setlength\textwidth{352.81416pt} \AtBeginDocument{\setlength\parindent{0pt}} \setcounter{equation}{2} \renewcommand\theequation{10.\arabic{equation}} %StartShownPreambleCommands \usepackage{amsmath,color} %StopShownPreambleCommands \begin{document} \begin{align} y&= 2x^2 -3x +5\nonumber\\ & \hphantom{= \ 2\left(x^2-\frac{3}{2}\,x\right. }\textcolor{blue}{% \overbrace{\hphantom{+\left(\frac{3}{4}\right)^2- % \left(\frac{3}{4}\right)^2}}^{=0}}\nonumber\\[-11pt] &=2\left(\textcolor{red}{\underbrace{x^2-\frac{3}{2}\,x + \left(\frac{3}{4}\right)^2}} \underbrace{-\left(\frac{3}{4}\right)^2 + \frac{5}{2}}\right)\\ &=2\left(\qquad\textcolor{red}{\left(x-\frac{3}{4}\right)^2} \qquad + \ \frac{31}{16}\qquad\right)\nonumber\\ y\textcolor{blue}{{}-\frac{31}{8}} &=2\left(x\textcolor{cyan}{{}-\frac{3}{4}}\right)^2 \Rightarrow S\left(\frac{3}{4}\right|\left.\frac{31}{8}\right)\nonumber \end{align} \end{document}