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If x^2+ 4ax +2 >0 for all values of x, t...

If `x^2+ 4ax +2 >0` for all values of x, then a lies in the interval:

A

(-2,4)

B

(1,2)

C

`(- sqrt2,sqrt2)`

D

`(-1/sqrt2, 1/sqrt2)`.

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MODERN PUBLICATION-LINEAR INEQUATIONS-EXERCISE
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  2. If one root of the equation lx^2+mx+n=0 is 9/2 (l, m and n are positiv...

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  3. If x^2+ 4ax +2 >0 for all values of x, then a lies in the interval:

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  4. If x+iy= sqrt(((a+ib))/((c+id))), then x^2+y^2 equals :

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  5. The solution of the equation |z|-z=1+2i is :

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  6. If alpha and beta are the roots of x^2+x+1=0, then alpha^16 + beta^16 ...

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  7. The complex number (1+2i)/(1-i) lies in:

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  8. If P is a point in the Argand diagram corresponding to the complex num...

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  9. The smallest positive integral value of ‘n’ such that [(1+sin frac (pi...

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  10. For (|x-1|)/(x+2) <1, x lies in the interval :

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  11. If a, b, c >0 and if abc=1, then the Value of a+b+c+ab+bc+ca lies in t...

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  12. Let z and w be two complex numbers such that |z|le1, |w|le1 and |z-iw|...

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  17. If the equation : (a +1) x^2 -(a+2)x+(a+3)=0 has roots equal in magni...

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  18. If alpha and beta are the roots of the quadratic equation x^2+4x+3=0,...

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  19. Which one of the following is one of the roots of the equation (b-c) x...

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  20. What is the value of x satisfying the equation : 16((a-x)/(a+x))^3= (a...

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