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Math Help - derivatives

  1. #1
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    derivatives

    Suppose that the function j' has an inflrction point at x=2. What, if anything does this imply about

    (a) j"?

    (b) j?

    I do not understand derivatives. I know you have to base your answer off the information given but I don't understand how to do that. Is it like since x=2 that means j(x) > 0 so would j(2)=3 and j"(2)=-3. Im really not sure can someone please explain derivatives to me. Thank you
    Last edited by asweet1; September 27th 2009 at 01:49 PM. Reason: still do not understand
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  2. #2
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    Quote Originally Posted by asweet1 View Post
    Suppose that the function j' has an inflrction point at x=2. What, if anything does this imply about

    (a) j"?

    (b) j?
    you might help your understanding by researching the answers to these questions ...

    1. what is a point of inflection?

    2. how does one go about finding inflection points?
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  3. #3
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    help

    The point of inflection is x=2 and you find the inflection point when the concavity switches direction so it would be switching to concave down so would j''(2)= -3. I have yet to full grasp the concept of derivatives. Do you just make guess in order to get answers?
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  4. #4
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    Quote Originally Posted by asweet1 View Post
    The point of inflection is x=2 and you find the inflection point when the concavity switches direction so it would be switching to concave down so would j''(2)= -3. I have yet to full grasp the concept of derivatives. Do you just make guess in order to get answers?
    Wrong. At a point of inflection the double derivative is equal to zero. It would be wise to do the research suggested in an earlier post.
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