\[f(x) = \left\{ \begin{matrix} - 2x - 4;\ \ \ \ \ \ x < - 1 \\ - x^{2};\ \ \ \ \ - 1 \leq x \leq 3 \\ \end{matrix} \right.\ \]
\[ООФ:\ \ \ D(f) = ( - \infty;3\rbrack.\]