Given $A = \left[ \begin{array} { l l } 6 & 5\end{array} \right]$

question 4

Essay

Given $A = \left[ \begin{array} { l l } 6 & 5\end{array} \right]$ , $B = \left[ \begin{array} { l l } - 5 & 4 \\6 & 7\end{array} \right]$ , find $A B$ , or explain why the operation cannot be performed.