Solve this following

If $A=\left[\begin{array}{ll}3 & 2 \\ 7 & 5\end{array}\right]$ and $B=\left[\begin{array}{ll}6 & 7 \\ 8 & 9\end{array}\right]$, verify that $(A B)^{-1}=B^{-1} A^{-1}$