Question

If $A=\left[\begin{array}{cc}1& 2\\ 0& 3\end{array}\right]$ and $B=[3-1]$, then $BA=$

• A. $\left[\begin{array}{cc}3& 0\\ 0& 3\end{array}\right]$
• B. $\left[30\right]$
• C. $\left[33\right]$
• D. $[0-3]$

Answer 1

The correct option is C $\left[33\right]$

The value of $BA$

$=[3-1]\left[\begin{array}{cc}1& 2\\ 0& 3\end{array}\right]$

$=[3\times 1-1\times 03\times 2-1\times 3]$

$=\left[33\right]$