Given $A = \left[ \begin{array} { c c } 3 & - 1 \\2 & 2\end{array} \right]$

Essay

Given $A = \left[ \begin{array} { c c } 3 & - 1 \\2 & 2\end{array} \right]$
and $B = \left[ \begin{array} { c c } 2 & 3 \\- 1 & 5\end{array} \right]$
, find $A B$ , or explain why the operation cannot be performed.