Question: Compute \(\underset{x\to {{3}^{-}}}{\mathop{\lim }}\,f\left( x \right)\) and \(\underset{x\to {{3}^{+}}}{\mathop{\lim }}\,f\left( x \right)\), where

\[f\left( x \right)=\left\{ \begin{aligned} & 2{{x}^{2}}-x\,\,\,\,\text{if }x<3 \\ & 3-x\,\,\,\,\,\,\,\,\,\text{if }x\ge 3 \\ \end{aligned} \right.\]