1 The matrix \(\mathbf { A }\) is given by \(\mathbf { A } = \left( \begin{array} { l l } 4 & 1
5 & 2 \end{array} \right)\) and \(\mathbf { I }\) is the \(2 \times 2\) identity matrix. Find
- \(\mathbf { A } - 3 \mathbf { I }\),
- \(\mathrm { A } ^ { - 1 }\).