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+%%
+%% An UIT Edition example
+%%
+%% Example 05-01-2 on page 72.
+%%
+%% Copyright (C) 2010 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[]{exaarticle}
+\pagestyle{empty}
+\setlength\textwidth{375.57637pt}
+\setlength\parindent{0pt}
+\StartShownPreambleCommands
+\usepackage{amsmath,xcolor}
+\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}}\\[-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)\\
+y\,\textcolor{blue}{\mathrel{-}\frac{31}{8}}
+ &= 2\left(x\,\textcolor{cyan}{\mathrel{-}\frac{3}{4}}\right)^2%
+\end{align*}
+\end{document}