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Math Help - Find f(x) from f"(x)

  1. #1
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    Find f(x) from f"(x)

    can someone please check to see which ne is correct? i was going over my homework and realized i may have done them wrong.


    https://www.dropbox.com/s/9ozxqd2blr...2020.46.49.jpg (i think is wrong)

    https://www.dropbox.com/s/ss9hsvvidx...2020.44.47.jpg (i think is right)
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  2. #2
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    Re: Find f(x) from f"(x)

    To find f(x) from f'', you simply integrate the function with respect to which ever variable you're working with. For instance, if you were working with

    f''(x) = x
    f'(x) would be x^2/(2)
    and hence

    f(x) would be f^3/(6)
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  3. #3
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    Re: Find f(x) from f"(x)

    Why do you think the first one is wrong? It's correct...
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  4. #4
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    Re: Find f(x) from f"(x)

    and the second one is wrong?

    i see what i did. im going mad, i think.

    ETA: can someone please explain anyway? thanks
    Last edited by noork85; May 4th 2013 at 07:06 PM.
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  5. #5
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    Re: Find f(x) from f"(x)

    No the first one is wrong. You plugged in 1 instead of 0 for x when you solved the first derivative. (I didn't read the whole thing so I don't know if you also did that when you solved f(x) or not
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  6. #6
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    Re: Find f(x) from f"(x)

    exactly why i thought the first one was wrong....thanks.
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  7. #7
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    Re: Find f(x) from f"(x)

    disregard
    Last edited by jpritch422; May 5th 2013 at 08:47 AM.
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