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If A=[(alpha,2),(2,alpha)] and |A^(3)|...

If `A=[(alpha,2),(2,alpha)]` and `|A^(3)|=125`, then the value of `alpha` is -

A

`pm2`

B

`pm3`

C

`pm5`

D

0

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The correct Answer is:
B
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CHHAYA PUBLICATION-MCQ ZONE -Question Paper 6
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  2. If 2X+[(1,2),(3,4)]=[(3,8),(7,2)], then the matrix X is equal to -

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  10. The projection of the vector vec alpha=2hati+3hatj+2hatk on the vector...

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  11. If the position vectors of the points A, B, C, D are hati+hatj+hatk,...

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  12. Let OP = 21 where O is the origin, if the direction radios of OP are p...

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  13. The vector equation of the line passing through the point (3, -1, 2) a...

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  15. The cartesian equation of a straight line is (x-3)/(4)=(y+2)/(5)=(z-...

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  16. Three vectors veca, vecb, vec c are such that |veca|=3, |vecb|=2, |ve...

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  17. The value of hati*(hatk xx hatj) + hatj*(hati xx hatk)+hatk*(hatj xx h...

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  18. The angle between the planes x-2y+2z=5 and 2x-3y+6z=11 is -

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