\[f(x) = \left\{ \begin{matrix} 4,\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ x < - 3 \\ x²,\ \ \ \ - 3 \leq x \leq 2 \\ x - 8,\ \ \ \ \ \ \ \ \ \ \ x > 0 \\ \end{matrix} \right.\ \]
\[f(3) = 3 - 8 = - 5\]