If A=[(a+ib,c+id),(-c+id,a-ib)] and a^(2...

If `A=[(a+ib,c+id),(-c+id,a-ib)]` and `a^(2)+b^(2)+c^(2)+d^(2)=1`, then `A^(-1)` is equal to

`[(a-ib,-c-id),(c-id,a+ib)]`

`[(a+ib,-c+id),(-c+id,a-ib)]`

`[(a-ib,-c-id),(-c-id,a+ib)]`

none of these

Text Solution

Verified by Experts

The correct Answer is:

We have,
`|A|=(a+ib) (a-ib)-(-c+id) (c+id)`
`=a^(2)+b^(2)+c^(2)+d^(2)=1`
and adj `(A)=[(a-ib,-c-id),(c-id,a+ib)]`
Then `A^(-1)=[(a-ib,-c-id),(c-id,a+ib)]`

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