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Math Help - Help , please ! I don't know

  1. #1
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    Angry Help , please ! I don't know

    if f(x)= x/(x^2 +1)
    (a) find f'(x) and f''(x)
    Check to see that your answers to part (a) are reasonable by comparing the graphs of f, f' and f''

    Help me !
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  2. #2
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    Quote Originally Posted by butbi9x View Post
    if f(x)= x/(x^2 +1)
    (a) find f'(x) and f''(x)
    Check to see that your answers to part (a) are reasonable by comparing the graphs of f, f' and f''

    Help me !
    Start by using the quotient rule to get f'(x).

    To get f''(x), use the quotient rule to differentiate f'(x).
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  3. #3
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    Red face huhu

    I don't understand
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  4. #4
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    Quote Originally Posted by butbi9x View Post
    I don't understand
    Then go back to your textbook or class notes and revise the quotient rule and the chain rule. Then read my first post again.
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  5. #5
    Junior Member toraj58's Avatar
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    if

    h(x) = \frac {f(x)}{g(x)}

    then

    h^\prime(x) = \frac {f^\prime(x)g(x) - g^\prime(x)f(x)}{g^2(x)}
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