Q. 295.0( 1 Vote )

# Compute (AB)^{ }

Answer :

We have,

To find: (AB)^{-1}

We know that,

(AB)^{-1} = B^{-1}A^{-1}

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

Firstly, we find |A|

Expanding |A| along C_{1}, 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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