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Homework Help: Integral problem, does b & a change sometime in the problem?

  1. Aug 23, 2009 #1
    Problem number 16
    http://img29.imageshack.us/img29/3179/38653938.png [Broken]
    For the record the y at the end is cubed. Thanks in advance.
    Last edited by a moderator: May 4, 2017
  2. jcsd
  3. Aug 23, 2009 #2
    If you are referring to the limits of integration, then yes they change if you make the proper substitution that makes this integral very easy.
  4. Aug 23, 2009 #3
    What do you mean by: "do b and a change sometime?" Are you talking about the limits of integration changing?
  5. Aug 23, 2009 #4
    Yes the bounds or limits. b=2 and a=0 Why do they change to other numbers later on during the problem?
  6. Aug 23, 2009 #5


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    If you substitute, for example, [tex]u=1+y^3[/tex], then the limits will change from ya=0, yb=2 to ua=1 and ub=9. That's because you're integrating with respect to u instead of y.
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