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The roots of the equation |(1,4,20),(1,-...

The roots of the equation `|(1,4,20),(1,-2,5),(1,2x,5x^(2))|=0` are -

A

`-1,-2`

B

`-1,2`

C

`1,-2`

D

`1, 2`

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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 |(a+a(1)x,1+b(1)x,1+c(1)x),(1+a(2)x,1+b(2)x,1+c(2)x),(1+a(3)x,1+b(3...

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  3. The roots of the equation |(1,4,20),(1,-2,5),(1,2x,5x^(2))|=0 are -

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  4. Let veca and vecb are non-collinear vectors and vecp=(x+4y)veca+(2x+...

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  5. The position vectors of the points A, B, C and D are hati+3hatj-hatk, ...

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  6. A function f:R to R is defined by f(x)=(x-1)(x-2). Which one of the fo...

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  7. If f(x)=ax+b and g(x)=cx+d are such that (fog)(x)=(gof)(x), then whic...

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  8. Let f(x)=[x] where [x] denotes the greatest integer in x. Which one o...

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  9. The value of ("sin"^(-1)(4)/(5)+2"tan"^(-1)(1)/(3)) is -

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  10. If sin["sin"^(-1)(1)/(5)+cos^(-1)x]=1, then the value of x is -

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  11. If f(x)=sin^(2)x and and composite function g{f(x)}=|sinx|, then the ...

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  12. If f(2x+3)=sinx+2^(x), then the value of f(4m-2n+3) is -

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  13. If l(x) is the integer not less than x and g(x) is the greatest intege...

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  14. It is known that the probability of a male birth is (1)/(2), then the ...

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  15. Let X represent the difference between the number of heads and the n...

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  16. If A is a square matrix of order 3xx3 and k a scalar, then adj(kA) is ...

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  17. If A=[(0,1,2),(1,2,3),(3,1,1)] and its inverse B=[b(ij)], then the el...

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  18. The inverse of the matrix [(cos2theta, -sin2theta),(sin2theta, cos2th...

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  19. If [(a(11),a(12),a(13)),(a(21),a(22),a(23)),(a(31),a(32),a(33))]=[(1,2...

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  20. If 2X+[(1,2),(3,4)]=[(3,8),(7,2)], then the matrix X is equal to -

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