The matrices $\left[\begin{array}{ll}x & x \ x & x\end{array} ight], x
eq 0$ form a group under

Question

The matrices $\left[\begin{array}{ll}x & x \ x & x\end{array}ight], x 
eq 0$ form a group under multiplication. The identity element for the group is\

Professor PC Thomas Classes · Answer

(c) $\left[\begin{array}{ll}\mathrm{a} & \mathrm{a} \ \mathrm{a} & \mathrm{a}\end{array}ight]\left[\begin{array}{ll}1 / 2 & 1 / 2 \ 1 / 2 & 1 / 2\end{array}ight]=\left[\begin{array}{ll}\mathrm{a} & \mathrm{a} \ \mathrm{a} & \mathrm{a}\end{array}ight]$\