If A =[2 3 ] and B [ 1 -2] then verify that (AB)‐¹=B‐¹1 -4

This question was asked in Ex 4.2, 4

If A =[2 3 ] and B [ 1 -2] then verify that (AB)‐¹=B‐¹
1 -4 -1 3
A‐¹