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If A is singular then A(adjA)=?...

If A is singular then A(adjA)=?

A

a unit matrix

B

a null matrix

C

a symmetric

D

none of these

Text Solution

Verified by Experts

The correct Answer is:
B
Given `|A|=0.So , A(adjA)=|A|.I=0.I=0`
`therefore` A(adjA) is a null matrix
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RS AGGARWAL-SYSTEM OF LINEAR EQUATIONS-Objective Questions
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  2. If A=[[2,-2,-4],[-1,3,4],[1,-2,-3]] then A is 1) an idempotent matrix ...

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  3. If A is singular then A(adjA)=?

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  4. if for any 2*2 square matrix A , A(adjA)=[[8 , 0] , [0 , 8]] then writ...

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  5. If A=[(-2,3),(1,1)] then |A^(-1)|=?

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  6. If A=[{:(3,1),(7,5):}], find x and y such that A^(2)+xI=yA.

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  7. If matrices A and B anticommute then

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  8. If A=[{:(2,5,),(1,3,):}] , find adj A.

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  9. If A=[(3,-4),(-1,2)] and B is a square matrix of order 2 such that AB=...

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  10. If A; B are invertible matrices of the same order; then show that (AB)...

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  11. If A=[(2,-1),(1,3)], then A^(-1)=?

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  12. If |A|=3 and A^(-1)=[(3,-1),((-5)/3,2/3)] then adjA=?

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  13. If A is an invertible matrix and A^(-1)=[(3,5),(5,6)] then A=?

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  14. If A=[(1,4),(4,-3) and f(x) =2x^2-4x+5 then f(A) =?

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  15. If A=[(1,2),(4,3)] then A^2-4A=?

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  16. If A is 2-rowed square matrix and |A|=6 then A,adjA=?

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  17. If A is 3 xx 3 invertible matrix, then show that for any scalar k (non...

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  18. If A=[(3,4,1),(1,0,-2),(-2,-1,2)] then A^(-1)=?

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  19. If A is a square matrix, then (1) A A' is symmetric (3) A'A is skew - ...

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  20. If A is a square matrix then (A-A') is

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