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If `A` is a non-singular matrix such that ` A A^T=A^T A` and `B=A^(-1)A^T ,` the matrix `B` is a. involuntary b. orthogonal c. idempotent d. none of these

A

involuntary

B

orthogonal

C

idempotent

D

none of these

Text Solution

Verified by Experts

The correct Answer is:
B
Given,
`B=A^(-1) A^(T)`
`implies B^(T)=(A^(-1)A^(T))^(T)=Axx(A^(-1))^(T)`
`implies BxxB^(T)=A^(-1) A^(T)xxAxx(A^(-1))^(T)`
`=A^(-1)xx(A^(T)xxA)(A^(-1))^(T)`
`=A^(-1) (AxxA^(T)) (A^(-1))^(T)`
`=(A^(-1) A)xx(A^(-1) A)^(T)=IxxI^(T)=I`
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