We have,

We have to find A^-1 and

Firstly, we find |A|

Expanding |A| along C₁, we get

= 2(4 – (-6)) – 2(-6 – (-6)) + 3(-9 – 6)

= 2(4 + 6) – 2(-6 + 6) + 3(-15)

= 2(10) – 2(0) – 45

= 20 – 45

= -25

Now, we have to find adj A and for that we have to find co-factors:

Ans.