$f ( x ) = \left\{ \begin{array} { c } x ^ { 2 } \text { if } x < 3 \\2 x + 2 \text { if } x \geq 3\end{array} \right.$

Essay

$f ( x ) = \left\{ \begin{array} { c } x ^ { 2 } \text { if } x < 3 \\2 x + 2 \text { if } x \geq 3\end{array} \right.$ Find $\lim _ { x \rightarrow 3 } f ( x )$ if it exists. Otherwise, explain by one-sided limits.