\begin{exercice}
 Déterminer trois fonctions trinômes $f$, $g$ et $h$ qui vérifient chacune le tableau de variations ci-dessous. 
 
 \begin{center}
  \begin{tikzpicture}[general, scale=0.75]
\tkzTabInit[color, colorC=H4, colorV=H4, colorL=H4, colorT=A4, lw=0.3mm]{$x$/1,$f(x)$/2}{$-\infty$,$-1$,$+\infty$}
\tkzTabVar{+/,-/$2$,+/}

\end{tikzpicture}
\begin{tikzpicture}[general, scale=0.75]
\tkzTabInit[color, colorC=H4, colorV=H4, colorL=H4, colorT=A4, lw=0.3mm]{$x$/1,$g(x)$/2}{$-\infty$,$2$,$+\infty$}
\tkzTabVar{+/,-/$-4$,+/}
\end{tikzpicture}

\begin{tikzpicture}[general, scale=0.75]
\tkzTabInit[color, colorC=H4, colorV=H4, colorL=H4, colorT=A4, lw=0.3mm]{$x$/1,$h(x)$/2}{$-\infty$,$-4$,$+\infty$}
\tkzTabVar{-/,+/$3$,-/}
\end{tikzpicture}
 \end{center}
\end{exercice}

