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 $IB$
✓
Answer
$\begin{array}{l}I B=\left[\begin{array}{ll}1 & 0 \\ 0 & 1\end{array}\right]\left[\begin{array}{cc}1 & -1 \\ 3 & 2\end{array}\right] \end{array} $
$ =\left[\begin{array}{cc}1+0 & -1+0 \\ 0+3 & 0+2\end{array}\right] $
$=\left[\begin{array}{cc}1 & -1 \\ 3 & 2\end{array}\right]=B$
$ =\left[\begin{array}{cc}1+0 & -1+0 \\ 0+3 & 0+2\end{array}\right] $
$=\left[\begin{array}{cc}1 & -1 \\ 3 & 2\end{array}\right]=B$
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