Q. 6

# Find the adjoint of the given matrix and verify in each case that A. (adj A) = (adj A) =m |A|.I.

Here,

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

= -2I

= -2I

Calculating |A|.I

Expanding along C1, we get

= [0(2 – 3) – (1){1 – 2} + 3(3 – 4)]I

= [0 – 1(-1) + 3(-1)] I

= (1 – 3)I

= -2I

Hence Proved

Ans.

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