5. \(\mathbf { R } = \left( \begin{array} { l l } a & 2
a & b \end{array} \right)\), where \(a\) and \(b\) are constants and \(a > 0\).
- Find \(\mathbf { R } ^ { 2 }\) in terms of \(a\) and \(b\).
Given that \(\mathbf { R } ^ { 2 }\) represents an enlargement with centre ( 0,0 ) and scale factor 15 ,
- find the value of \(a\) and the value of \(b\).