3.
$$\mathbf { A } = \left( \begin{array} { l l l }
2 & k & 2
2 & 2 & k
1 & 2 & 2
\end{array} \right) \quad \text { where } k \text { is a constant }$$
- Determine the values of \(k\) for which \(\mathbf { A }\) is singular.
Given that \(\mathbf { A }\) is non-singular,
- find \(\mathbf { A } ^ { - 1 }\), giving your answer in terms of \(k\).
3.