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+\documentclass[a4paper,12pt]{classPres}
+\usepackage{tkz-fct}
+
+\author{}
+\title{}
+\date{}
+
+\begin{document}
+\begin{frame}{Questions flashs}
+    Développer l'expression
+    \[ A = -3(x+5)^2 - 7 \]
+    Mettre sous forme canonique
+    \[ B = x^2 - 6x - 7 \]
+\end{frame}
+
+\begin{frame}{Correction}
+    \begin{eqnarray*}
+        A &=& -3(x+5)^2 - 7 \\
+          &=& -3x^2 - 30x - 82 
+    \end{eqnarray*}
+    \hline
+    \begin{eqnarray*}
+       B = x^2 - 6x - 7
+    \end{eqnarray*}
+    \[ \alpha = \frac{-b}{2a} = 3 \]
+    \[ \beta = -\frac{b^2-4ac}{4a} = -\frac{36+38}{4} = -16 \]
+    \begin{eqnarray*}
+        B &=& (x - 3)^2 - 16 \\
+    \end{eqnarray*}
+\end{frame}
+
+\end{document}