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Let f (x) =x ^(3) + 6x ^(2) + ax +2, if ...

Let `f (x) =x ^(3) + 6x ^(2) + ax +2, if (-3, -1)` is the largest possible interval for which `f (x)` is decreasing function, then `a=`

A

3

B

9

C

`-2`

D

1

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The correct Answer is:
B
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VK JAISWAL ENGLISH-APPLICATION OF DERIVATIVES -EXERCISE (SUBJECTIVE TYPE PROBLEMS)
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  3. On [1,e], then least and greatest vlaues of f (x) = x^(2)ln x are m a...

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  4. If f (x)= (px)/(e ^(x)) - (x ^(2))/(2) + x is a decreasing function f...

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  5. Let f (x)= {{:( xe ^(ax)"," , x le 0),( x+ ax ^(2)-x ^(3)"," , x gt 0)...

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  6. Find sum of all possible values of the real parameter 'b' if the diffe...

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  7. Let 'theta' be the angle in radians between the curves (x ^(2))/(36) +...

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  8. Let set of all possible values of lamda such that f (x)= e ^(2x) - (la...

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  9. Let a,b,c and d be non-negative real number such that a ^(5)+b^(5) le ...

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  10. There is a point (p,q) on the graph of f(x)=x^(2) and a point (r,s) on...

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  14. Let the maximum value of expression y= (x ^(4)-x ^(2))/(x ^(6) + 2x ^(...

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  15. The least positive vlaue of the parameter 'a' for which there exist at...

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  16. Let f (x) =x ^(2) +2x -t ^(2) and f(x)=0 has two root alpha (t ) and b...

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  17. A tank contains 100 litres of fresh water. S solution containg 1 gm/li...

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  18. If f (x) is continous and differentiable in [-3,9] and f'(x) in [-2,8]...

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  19. It is given that f (x) is defined on R satisfying f (1)=1 and for AA ...

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  20. The number of normals to the curve 3y ^(3) =4x which passes through th...

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  21. Find the number of real root (s) of the equation ae ^(x) =1+ x + (x ^(...

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