Solve this following

If $A=\left[\begin{array}{cc}9 & -1 \\ 6 & -2\end{array}\right]$ and $B=\left[\begin{array}{cc}-4 & 3 \\ 5 & -4\end{array}\right]$, verify that $(A B)^{-1}=B^{-1} A^{-1}$