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if A=[[m,-2 ] ,[-2,m]] and |A|^2 =25 , t...

if A=[[m,-2 ] ,[-2,m]] and `|A|^2` =25 , then m=

A

`+-1`

B

`+-2`

C

`+-3`

D

`+-4`

Text Solution

Verified by Experts

The correct Answer is:
C
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JMD PUBLICATION-Determinants-Exercise
  1. If [[2x , 5], [4,2]] is singular, then x =

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  2. If |[[x,2],[18,x]]|=|[[6,2],[18,6]]|, then x is equal to:

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  3. if A=[[m,-2 ] ,[-2,m]] and |A|^2 =25 , then m=

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  4. Let |A| be square matrix of order 3 and |A| = 6, then |2A| =

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  5. Let A be a non-singular matrix of order 3 xx 3. Then I adj. A I is equ...

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  6. If A and B are square matrices of order 3 x 3 such that |A|=2,|B|=3, t...

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  7. If A be a matrix of order 4 x 4 and |A| =20, then |A^-1| =

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  8. If A =[[1,3],[2,4]] ,then A.(Adj. A) =

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  9. If A is non-singular matrix of order 3 and |A|=4 then |Adj. (Adj. A)| ...

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  10. Fill In the blanks : If A is square matrix of order 3 and |A| = 5, the...

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  11. Fill In the blanks : If A is of order 4 x 4 and |A| = 3, then |A^-1|=

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  12. Fill In the blanks : If A is square matrix of order 3 and |A| = 6, the...

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  13. Fill In the blanks : If [[x,4] , [9,x] = [5,3] , [4,5]] then x=

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  14. State true/false:If A is square matrix of order 3 and |A| = 4 then |3A...

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  15. State true/false:If A is square matrix of order 4 and |A|= 5 then |Adj...

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  16. State true/false:IF A is square matrix then | A^-1| = 1/|A|

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  17. Solve by matrix method 3x - 4y + 2z = -1 , 2x + 3y +5z = 7 , x+ z =2

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  18. Solve by matrix method (2/x) + (3/y) + (10/z) =4, (4/x) - (6/y) + (5/z...

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  19. The sum of three numbers is 6. If we multiply third number by 3 and ad...

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  20. Solve by matrix method 3x + 2y + z= 1000, 4x + y+ 3z = 1500, and x + y...

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