\( \begin{array}{l}f x=\left(3-x^{2}\right) \\ x=2\end{array} \)

Step 1 ：\( f(2) = (3 - 2^{2}) \)

Step 2 ：\( f(2) = (3 - 4) \)

Step 3 ：\( f(2) = -1 \)