Multiple Choice Questions on If at x 1 function f x x4 62 x2 ax 9 has max value then find the value of lsquo a rsquo ........ for NDA Exam Preparation

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Multiple Choice Questions

If at x 1 function f x x4 62 x2 ax 9 has max value then find the value of lsquo a rsquo ........

Mathematics (NDA) Diffrentiation
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    If at x=1 ,function f(x)=x4 -62 x2+ax +9 has max value then find the value of ‘a’ ?

    20

    Incorrect Answer

    60

    Incorrect Answer

    120

    Correct Answer

    100

    Incorrect Answer
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    Explanation:

    f(x)=x4 -62 x2+ax +9

    dy/dx  =4 x2  -124 x +a

    at x=1 given maximum value

    f ’(1)=a-120

    a-120=0

    a= 120

     

    By: bhavesh kumar singh
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