Question 3 - A-Level Maths

\(\mathbf { M } = \left( \begin{array} { c c } k & k
3 & 5 \end{array} \right) \quad\) where \(k\) is a non-zero constant
1. Determine \(\mathbf { M } ^ { - 1 }\), giving your answer in simplest form in terms of \(k\).
Hence, given that \(\mathbf { N } ^ { - 1 } = \left( \begin{array} { c c } k & k
4 & - 1 \end{array} \right)\)
determine \(( \mathbf { M N } ) ^ { - 1 }\), giving your answer in simplest form in terms of \(k\).