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If both A-1/2Ia n dA+1/2 are orthogonal...

If both `A-1/2Ia n dA+1/2` are orthogonal matices, then (a)`A` is orthogonal (b)`A` is skew-symmetric matrix of even order (c)`A^2=3/4I` (d)none of these

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CENGAGE PUBLICATION-MATRICES-All Questions
  1. In which of the following type of matrix inverse does not exist always...

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  2. If both A-1/2Ia n dA+1/2 are orthogonal matices, then (a)A is ortho...

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  3. If nth-order square matrix A is a orthogonal, then |adj(adjA)| is (...

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  4. If P is an orthogonal matrix and Q=P A P^T an dx=P^T Q^1000 P then x^...

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  5. If A is a nilpotent matrix of index 2, then for any positive integer n...

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  6. If Aa n dB are two matrices such that A B=Ba n dB A=A ,t h e n (A^5-B...

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  7. If Z is an idempotent matrix, then (I+Z)^n I+2^n Z b. I+(2^n-1)Z c. ...

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  8. If A is an orthogonal matrix then A^(-1) equals a.A^T b. A c. A^2 ...

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  9. If A^2=I, then the value of det(A-I) is (where A has order 3) 1 b. -1 ...

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  10. Let A be an nth-order square matrix and B be its adjoint, then |A B+K ...

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  11. A=[(a,1,0),(1,b,d),(1,b,c)],B=[(a,1,1),(0,d,c),(f,g,h)],U=[(f),(g),(h)...

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  12. If M is a 3 xx 3 matrix, where det M=1 and MM^T=1, where I is an ident...

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  13. If A is a diagonal matrix of order 3xx3 is commutative with every squa...

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  14. Let S be the set which contains all possible values of l ,m ,n ,p ,q ,...

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  15. Given a matrix A=[(a,b,c),(b,c,a),(c,a,b)], where a, b, c are real pos...

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  16. If A is a square matrix of order 3 such that |A|=2,t h e n|(a d jA^(-1...

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  17. Let A=[[3x^2], [1], [6x]],B=[a,b,c]and C=[[(x+2)^2, 5x^2, 2x],[5x^2, 2...

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  18. If A is an idempotent matrix satisfying, (I-0. 4 A)^(-1)=I-alphaA ,w h...

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  19. Let A=([a(i j)])(3xx3) be a matrix such that AA^T=4Ia n da(i j)+2c(i j...

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  20. Let A be the set of all 3xx3 skew-symmetri matrices whose entries are ...

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