1. $P=\left[\begin{array}{cc}\alpha & \alpha+1 \\ 1-\alpha & -\alpha\end{array}\right], Q=\left[\begin{array}{rrr}2 & 1 & 3 \\ 1 & 0 & 2 \\ 3 & 4 & -5\end{array}\right], X=\left[\begin{array}{l}x \\ y \\ z\end{array}\right]$ এবং $\mathrm{R}=\left[\begin{array}{l}4 \\ 0 \\ 2\end{array}\right]$