Let M be a 2 × 2 matrix such that $\mathrm{M}\left[\begin{array}{c}1\\ -1\end{array}\right]=\left[\begin{array}{c}-1\\ 2\end{array}\right]\text{ and }{\mathrm{M}}^2\left[\begin{array}{c}1\\ -1\end{array}\right]=\left[\begin{array}{l}1\\ 0\end{array}\right]$ If x₁ and x₂ (x₁ > x₂)  are the two
values of x for which det (M–XI)=0 where I is identity matrix of order 2 then the value of 5x₁ + 2x₂ is