2 The matrices \(\mathbf { A }\) and \(\mathbf { B }\) are given by \(\mathbf { A } = \left( \begin{array} { l l } 2 & 1
4 & 3 \end{array} \right)\) and \(\mathbf { B } = \left( \begin{array} { l l } 1 & 0
3 & 2 \end{array} \right)\). Find
- \(\mathbf { A B }\),
- \(\mathbf { B } ^ { - 1 } \mathbf { A } ^ { - 1 }\).