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Homework Help: Gradf and f

  1. Apr 8, 2009 #1
    1. The problem statement, all variables and given/known data

    Let gradf = (2xy + sin(x)i + (x2 + 2)j.
    Find f.

    2. Relevant equations

    3. The attempt at a solution

    http://img7.imageshack.us/img7/6303/ansh.th.jpg [Broken]

    why is my answer wrong?
    Last edited by a moderator: May 4, 2017
  2. jcsd
  3. Apr 8, 2009 #2


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    Homework Helper
    Gold Member

    If [tex] \nabla f = (2xy + \sin x)\bold{i} + (x^2 + 2)\bold{j}[/tex], your answer is correct.
  4. Apr 8, 2009 #3
    but then why webassign say it's wrong...
  5. Apr 8, 2009 #4


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    Homework Helper
    Gold Member

    I checked again and It still looks right to me. Maybe you read the question wrong, or entered it wrong.
  6. Apr 8, 2009 #5
    pretty sure it's not wrong... hmmm
  7. Apr 8, 2009 #6
    okay.. I think the answer is right, it's just the way I format the answer in webassign and it doesn't accepts it.. also if I am asked:

    Find the exact change in f between (0, 0) and (1, π/2).

    do I just plug the numbers in?
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