Question: If

\[g\left( x \right)=\left\{ \begin{aligned} & \sqrt{x-3}\,\,\,\,\,\,x\ge 3 \\ & 3-x\,\,\,\,\,\,\,\,\,\,x<3 \\ \end{aligned} \right.\]

find \(g\left( -1 \right)\) and \(g\left( 7 \right)\).