2 The matrices \(\mathbf { A } , \mathbf { B }\) and \(\mathbf { C }\) are given by \(\mathbf { A } = \left( \begin{array} { l l } 5 & 1 \end{array} \right) , \mathbf { B } = \left( \begin{array} { l l } 2 & - 5 \end{array} \right)\) and \(\mathbf { C } = \binom { 3 } { 2 }\).
- Find \(3 \mathbf { A } - 4 \mathbf { B }\).
- Find CB. Determine whether \(\mathbf { C B }\) is singular or non-singular, giving a reason for your answer.