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Math Help - I'm stuck with dis problem....

  1. #1
    Newbie calculus-geeks09's Avatar
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    Arrow I'm stuck with dis problem....

    ok i know how to do this problem but I'm stuck at the last part.

    the problem is :

    f(t)=sqrt(4t+1)

    find f''(2)

    I found the 1st derivative but i'm stuck at the 2nd derivative! I know that once I find the 2nd F''(x) I will plug the 2 but I'm stuck at the 2nd derivative.


    Plz help me get the 2nd derivative and i'm set !!!!



    Thanks
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  2. #2
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by calculus-geeks09 View Post
    ok i know how to do this problem but I'm stuck at the last part.

    the problem is :

    f(t)=sqrt(4t+1)

    find f''(2)

    I found the 1st derivative but i'm stuck at the 2nd derivative! I know that once I find the 2nd F''(x) I will plug the 2 but I'm stuck at the 2nd derivative.


    Plz help me get the 2nd derivative and i'm set !!!!



    Thanks
    what did you find for the first derivative?
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  3. #3
    Newbie calculus-geeks09's Avatar
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    this is the 1st derivative

    2t(4t+1)^-1/2

    or this is similar to :

    2t/sqrt.(4t+1)
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  4. #4
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by calculus-geeks09 View Post
    this is the 1st derivative

    2t(4t+1)^-1/2

    or this is similar to :

    2t/sqrt.(4t+1)
    both are incorrect.

    the first derivative is 2(4t + 1)^{-1/2}

    now can you find the second?


    by the way, to differentiate the expressions you had, you would use product rule in the first case and quotient rule in the second. but neither of those are needed for the correct answer
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  5. #5
    Newbie calculus-geeks09's Avatar
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    Quote Originally Posted by Jhevon View Post
    both are incorrect.

    the first derivative is 2(4t + 1)^{-1/2}

    now can you find the second?


    lol ! 1 little mistake changed my whole answer ! Thanks

    Thanks I got it !!!!


    thanks so much, u are a life saver !
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