Question

If $A=\left[\begin{array}{cc}0& 2\\ 5& -2\end{array}\right],B=\left[\begin{array}{cc}1& -1\\ 3& 2\end{array}\right]$ and $I$ is unit matrix of order $2\times 2$ Find :
$AI$

Answer 1

$Al=\left[\begin{array}{cc}0& 2\\ 5& -2\end{array}\right]\left[\begin{array}{cc}1& 0\\ 0& 1\end{array}\right]$

$=\left[\begin{array}{cc}0+0& 0+2\\ 5+0& 0-2\end{array}\right]$

$=\left[\begin{array}{cc}0& 2\\ 5& -2\end{array}\right]$