\begin{exercice}\label{2F3_completer_tableauVariations}
 Compléter le tableau de variations proposé à partir de représentation graphique ci-dessous.
 \begin{center}
 \begin{tikzpicture}[general,yscale=0.78]
\tkzTabInit[lgt=1.3,espcl=2.85, color, colorC=H4, colorV=H4, colorL=H4, colorT=A4, lw=0.3mm]
{ $x$ / 1,  $f(x)$ / 2}{ $-4$,\textcolor{A4}{$-1$},4}
\tkzTabVar[color=A4]{+/2,-/\textcolor{H4}{$-1{,}5$},+/2}
\end{tikzpicture}
\end{center}
\vspace{-1em}
\begin{center}
\begin{tikzpicture}[general, scale=0.78]
 \draw[quadrillage55] (-4,-2.5)grid (4,2);
 \axeX{-4}{4}{1}
 \axeY{-2.5}{2}{1}
 \origine
 \draw[smooth, epais, color=C1] plot coordinates{(-4,2)(-3,0)(-1,-1.5)(3,0)(4,2)};
\end{tikzpicture}
\end{center}

\end{exercice}
