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If A=[(1,3),(2,1)] then the determinant ...

If `A=[(1,3),(2,1)]` then the determinant of `A^(2)-2A` is

A

5

B

25

C

`-5`

D

`-25`

Text Solution

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The correct Answer is:
B
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AAKASH SERIES-MATRICES -DETERMINANTS- EXERCISE - II
  1. If A=[(1,3),(2,1)] then the determinant of A^(2)-2A is

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  2. |(1990,1991,1992),(1991,1992,1993),(1992,1993,1994)|=

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  3. Show that |{:(x,a,a),(a,x,a),(a,a,x):}|=(x+2a)(x-a)^2

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  4. Show that |(a+b+2c,a,b),(c,b+c+2a,b),(c,a,c+a+2b)|=2(a+b+c)^(3).

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  5. Prove that |{:(y+z,x,x),(y,z+x,y),(z,z,x+y):}|=4xyz

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  6. If|(a+b,b+c,c+a),(b+c,c+a,a+b),(c+a,a+b,b+c)|=k|(a,b,c),(b,c,a),(c,a,b...

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  7. |{:(a-b-c,2b,2c),(2a,b-c-a,2c),(2a,2b,c-a-b):}|=

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  8. If a!=6,b,c satisfy |(a,2b,2c),(3,b,c),(4,a,b)|=0 then abc

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  9. If w is a complex cube root unity then |{:(1,1+w,1+w^(2)),(1+w,1+w^(2)...

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  10. If alpha, beta, gamma are the roots of x^(3)+px+q=0 then |(alpha, beta...

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  11. |(1,log(x)y,log(x)z),(log(y)x,1,log(y)z),(log(z)x,log(z)y,1)|=

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  12. |(1//a,a^(2),bc),(1//b,b^(2),ca),(1//c,c^(2),ab)|=

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  13. Let A=[(5,5 alpha, alpha),(0, alpha, 5 alpha),(0,0,5)] If |A|^(2)=25 t...

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  14. If k gt1, and the determinant of the matrix A^(2), where A=[(k,kalpha,...

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  15. If bc+ca+ab=18, and |(1,a^(2),a^(3)),(1,b^(2),b^(3)),(1,c^(2),c^(3))|=...

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  16. If a,b,c are positive and not all equal then |(a,b,c),(b,c,a),(c,a,b)|

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  17. |(a^(2)+x,ab,ac),(ab,b^(2)+x,bc),(ac,bc,c^(2)+x)|

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  18. Show that A=|{:(-2a,a+b,c+a),(a+b,-2b,b+c),(c+a,c+b,-2c):}|=4(a+b)(b+c...

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  19. If a+b+c=0 and |(a-x,c,b),(c,b-x,a),(b,a,c-x)|=0 then x=

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  20. If |(lamda^(2)+3lamda, lamda-1, lamda+3),(lamda+1, 2-lamda,lamda-4),(l...

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