Given that \(P = \begin{pmatrix} 2& -1 \\ 3 & -2 \end{pmatrix}, Q = \begin{pmatrix} 1& 5\\ 2& -3 \end{pmatrix} and R = \begin{pmatrix} 4 & 3 \\ 1 & -2 \end{pmatrix}\) determine of QR - P