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+%% 
+%%  An UIT Edition example
+%% 
+%%  Example 10-03-1 on page 202.
+%% 
+%%  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}
+\AtBeginDocument{\setlength\parindent{0pt}}
+\StartShownPreambleCommands
+\usepackage{amsmath}
+\StopShownPreambleCommands
+\begin{document}
+\[
+\begin{array}{rcll}
+y & = & x^{2}+bx+c\\
+  & = & x^{2}+2\times\dfrac{b}{2}x+c\\
+  & = & \underbrace{x^{2}+2\times\dfrac{b}{2}x+\left(\frac{b}{2}\right)^{2}}-
+      {\left(\dfrac{b}{2}\right)^{2}+c}\\
+  &  & \qquad\left(x+{\dfrac{b}{2}}\right)^{2}\\
+  & = & \left(x+\dfrac{b}{2}\right)^{2}-\left(\dfrac{b}{2}\right)^{2}+c
+  & \left|+\left({\dfrac{b}{2}}\right)^{2}-c\right.\\
+    y+\left(\dfrac{b}{2}\right)^{2}-c & = & \left(x+
+    \dfrac{b}{2}\right)^{2} & \left|\strut(\textrm{vertex form})\right.\\
+y-y_{S} & = & (x-x_{S})^{2}\\
+S(x_{S};y_{S}) & \,\textrm{or}\,
+    & S\left(-\dfrac{b}{2};\,\left(\dfrac{b}{2}\right)^{2}-c\right)
+\end{array}
+\]
+\end{document}