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If A=[{:(2,7),(1,5):}] then what is A+3A...

If `A=[{:(2,7),(1,5):}]` then what is `A+3A^(-1)` equal to ?

A

3I

B

5l

C

7I

D

none of these

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PUNEET DOGRA-MATRIX-PREV YEAR QUESTIONS
  1. The matrix [{:(0,-4+i),(4+I,0):}] is

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  2. Which one of the following matrices is an elementary matrix ?

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  3. If A=[{:(2,7),(1,5):}] then what is A+3A^(-1) equal to ?

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  4. X=[{:(3,-4),(1,-1):}],B=[{:(5,2),(-2,1):}] and A=[{:(p,q),(r,s):}] the...

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  5. A[{:(x+y,y),(2x,x-y):}],B =[{:(2),(-1):}] and C [{:(3),(2):}]. If AB =...

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  6. v34

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  7. If A and B are two matrices of order 2 and det (A) is 3, det (B) is -1...

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  8. If, A and B be two matrices such that AB = A and BA=B. Then. Which of ...

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  9. If the matrix A is such that ({:(1,3),(0,1):})A=({:(1,1),(0,-1):}), th...

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  10. If A is invertible matrix. Then what is det (A^(-1)) equal to ?

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  11. If A, B, and C are three square matrices of the same order, then AB=AC...

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  12. If A=({:(4,x+2),(2x-3,x+1):}) is symmetric, then what is x equal to ?

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  13. Consider the following statements in respect of the matrix A=[{:(0,1,2...

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  14. Consider two matrices A=[{:(1,2),(2,1),(1,1):}] and B =[{:(1,2,-4),(2,...

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  15. If A is any matrix. Then the product AA is defied only when A is a mat...

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  16. If [{:(2,3),(4,1)]xx[{:(5,-2),(-3,1)]=[{:(1,-1),(17,lamda):}] then wha...

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  17. If A[{:(i,0),(0,-i)]B=[{:(0,-1),(1,0)] and C =[{:(0,i),(i,0):}] where ...

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  18. Consider the following statements: I. The product of two non-zero ma...

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  19. Consider the following statements : I. The matrix ({:(1,2,1),(2,2a,1...

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  20. If 2A=[{:(2,1),(3,2):}] then what is A^(-1) equal to ?

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