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If the trace of A is 7 then the trace of...

If the trace of A is 7 then the trace of 7A is

A

14

B

28

C

73

D

49

Text Solution

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The correct Answer is:
D
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AAKASH SERIES-MATRICES -ALGEBRA OF MATRICES -EXERCISE - I
  1. If A=[a(ij)] is scalar matrix then the trace of A is

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  2. Find the trace of [(1,3,-5),(2,-1,5),(2,0,1)]

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  3. If the trace of A is 7 then the trace of 7A is

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  4. If A is a skew symmetric matrix, then trace of A is

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  5. If A=[a(ij)] is a scalar matrix of order nxxn such that a(ii)=k for al...

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  6. If the traces of A are 19 and B are 8 then the trace of A-B is

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  7. If tr(A)=2+i then tr((2-i)A)=

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  8. If tr(A)=3,tr(B)=5 then tr(AB)=

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  9. If A=[(4,x+2),(2x-3,x+1)] is symmetric then trace of A is

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  10. If A=[(x,1,4),(-1,0,7),(-4,-7,0)] such that A'=-A then x=

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  11. P+Q=((2,3,5),(4,1,2),(1,2,1)),P is symmetric, Q is a skew symmetric ma...

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  12. If 3A+4B'=[(7,-10,17),(0,6,31)],2B-3A'=[(-1,18),(4,-6),(-5,-7)] then B...

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  13. If A=[(cos theta, sin theta, 0),(-sin theta, cos theta, 0),(0,0,1)] th...

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  14. If 3A=[(-1,2,2),(2,-1,2),(2,2,-1)] then

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  15. If A=[(2,x-3,x-2),(3,-2,-1),(4,-1,-5)] is a symmetric matrix then x =

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  16. If A=[(ab,b^(2)),(-a^(2),-ab)] then A is

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  17. If A=[(2,-2,-4),(-1,3,4),(1,-2,-3)] then A is

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  18. If A=[a(ij)](nxxn) and a(ij)="A.M." of {i,j} then A is

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  19. If the order of A is 4xx3, the order of B is 4xx5 and the order of C i...

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  20. If A is a 3xx4 matrix and B is matrix such that A^(T)Band BA^(T) are b...

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