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Easy integral question

  1. Jan 17, 2005 #1
    THis one just seems wierd, I know it should be easy but for some reason I am having trouble with it :(

    What is the anti-derivative of 7x^-1 ?
     
  2. jcsd
  3. Jan 17, 2005 #2
    7ln(x) + C.
     
  4. Jan 17, 2005 #3
    [tex]\int x^ndx=\frac{x^{n+1}}{n+1}+C[/tex]
     
  5. Jan 17, 2005 #4
    Using that won't work in this case.
     
  6. Jan 17, 2005 #5
    i read the q. wrong :P

    but sure it works using the fundamental theorem of calculus
     
  7. Jan 17, 2005 #6
    It still doesn't work. If you set n = -1, you'll be dividing by zero...
     
  8. Jan 17, 2005 #7
    [tex]\int \frac{1}{u}\,du=\ln|{u}|+C[/tex]
     
  9. Jan 18, 2005 #8


    good point

    SEE KIDS what can happen if you dont read the whole question???

    *blush* :tongue:
     
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