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Homework Help: Please check these

  1. Apr 22, 2006 #1
    This is a followup post for all the problems i posted yesterday.. please check them all.. i believe i got the correct answers.. Thanks a lot.

    1. Find the derivative:
    http://img225.imageshack.us/img225/7261/der42complete4fy.gif [Broken]

    2. Find the integral:
    http://img195.imageshack.us/img195/1766/int18complete2ua.gif [Broken]

    3. Find the integral:
    http://img225.imageshack.us/img225/7525/int20complete0pr.gif [Broken]

    4. Find the integral:
    http://img225.imageshack.us/img225/3107/int26complete9ld.gif [Broken]
     
    Last edited by a moderator: May 2, 2017
  2. jcsd
  3. Apr 22, 2006 #2

    nrqed

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    Before taking the derivative, the algebra is wrong. You must *divide* by x-2 whereas you multiplied by x-2. (I know that you were probably thinking of (-x-2) divided by (x*(x-1)/(x-2)) but what you have is instead (-x-2)/(x*(x-1)) divided by (x-2)
     
    Last edited by a moderator: May 2, 2017
  4. Apr 22, 2006 #3

    nrqed

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    The integrals are right (except that one would never write u^0/0 in the last one!!)
     
  5. Apr 22, 2006 #4
    ah, i forgot the reciprocal.. grr.. give me a few minutes.. i'll correct that and repost..
     
  6. Apr 22, 2006 #5
    here is a fix on the derivative one.. is this right now?

    http://img100.imageshack.us/img100/4594/der42complete1ag.gif [Broken]
     
    Last edited by a moderator: May 2, 2017
  7. Apr 22, 2006 #6

    dav2008

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    Looks good.
     
  8. Apr 22, 2006 #7

    nrqed

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    [/URL]

    Looks right to me
     
    Last edited by a moderator: May 2, 2017
  9. Apr 22, 2006 #8
    thanks :biggrin:
     
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