Q. 295.0( 1 Vote )

# Compute (AB)

We have,

To find: (AB)-1

We know that,

(AB)-1 = B-1A-1

and here, B-1 is given but we have to find A-1 and

Firstly, we find |A|

Expanding |A| along C1, we get

= 1(8 – 6) – 0 + 3(-3 – 4)

= 1(2) + 3(-7)

= 2 – 21

= -19

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

Now, we have

So,

Ans.

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