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If one root of the equation lx^2+mx+n=0 ...

If one root of the equation `lx^2+mx+n=0` is `9/2` (l, m and n are positive integers) and `m/(4n)=l/m`, then l+ n is equal to :

A

80

B

85

C

90

D

95

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MODERN PUBLICATION-LINEAR INEQUATIONS-EXERCISE
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  2. If 2 - i is a root of the equation ax^2+ 12x + b=0 (where a and b are ...

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  3. If one root of the equation lx^2+mx+n=0 is 9/2 (l, m and n are positiv...

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

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

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

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

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

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

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

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

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

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  14. Find the range of f(x)=(x^2+34 x-71)/(x^2+2x-7)

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  15. If ax^2+bx+c=0 and 2x^2+3x+4=0 have a common root, where a, b, c in N ...

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  16. If (3+i)(z+bar z)-(2+i) (z- bar z)+14i=0, then z bar z =

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  17. 4+5((-1+i sqrt3)/2)^2008 +3((-1+i sqrt3)/2)^2009=

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

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

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

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