1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Need help with an antiderivitive

  1. Feb 6, 2009 #1
    I can't seem to get this antiderivitive correct: sqrt(20-x) from 0 to 20.

    I end up with -(2/3)(sqrt(20-x)^(3/2) which is zero evaluated at either of the two limits.

    This is not correct since the area below the curve of the original equation is definately not 0.
     
  2. jcsd
  3. Feb 6, 2009 #2

    Mark44

    Staff: Mentor

    You shouldn't have sqrt in your answer since that's already accounted for in the 3/2 exponent. Also, the antiderivative functionis not zero for x = 0. Check it again.
     
  4. Feb 7, 2009 #3

    epenguin

    User Avatar
    Homework Helper
    Gold Member

    Yes and also it is not zero at both the limits; it should work out now.
     
  5. Feb 7, 2009 #4
    oops, i meant to write -(2/3)(20-x)^(3/2), but yeah, i didn't evaluate it correctly the first time. It should be:

    F(b)-F(a)=-(2/3)(20-20)^(3/2)-(-(2/3)(20-0)^(3/2))

    *Facepalm* I blame it on lack of sleep, haha.

    thanks.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Need help with an antiderivitive
  1. Need help (Replies: 1)

  2. Need help with this (Replies: 2)

  3. Need help (Replies: 1)

  4. Need Help (Replies: 0)

  5. Need help! (Replies: 3)

Loading...