1. Apr 12, 2009 #1

   Mathematics07

   

   1. The problem statement, all variables and given/known data
   The integral from -infinity to infinity of (2-x^4)dv
   
   
   2. Relevant equations
   U substitution
   
   
   3. The attempt at a solution
   Dont know what to use as my "u" ?
   
   
   
   Can someone please help me out? Thank you in advance.

    

   Mathematics07, Apr 12, 2009
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3. Apr 12, 2009 #2

   n!kofeyn

   

   You have a dv in your given integral. Is this the integral you mean?
   [tex]\int_{-\infty}^\infty (2-x^4) \,dx [/tex]
   If so, you do not need u-substitution here. Also, to compute an improper integral of this form you need to evaluate:
   [tex]\lim_{s\to\infty} \int_{-s}^s (2-x^4) \,dx [/tex]

    

   n!kofeyn, Apr 12, 2009
4. Apr 12, 2009 #3

   Mathematics07

   

   yes that the write integral . . so basically i just need to do regular anti derivate and then evaluate it ?

    

   Mathematics07, Apr 12, 2009
5. Apr 12, 2009 #4

   Jay J

   

   so for an example like this you would just do a regular anti derivative and then substitute your "s" in for the infinities and then evaluate >?
   
   -Jay J-

    

   Jay J, Apr 12, 2009

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