1. Limited time only! Sign up for a free 30min personal 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!

Homework Help: Finding the area between curves

  1. Dec 8, 2007 #1
    1. The problem statement, all variables and given/known data

    y = x^5 - 2ln(x+5)


    y = x^3 - 2ln(x+5)

    2. Relevant equations

    3. The attempt at a solution

    i put it ont he calculator but i honestly dont even no where the spot that i amtrying to find the area for is
  2. jcsd
  3. Dec 8, 2007 #2


    User Avatar
    Homework Helper

    well find where they intersect and you will find the limits of the required integral
  4. Dec 8, 2007 #3
    they intersect at x = 9.24???
  5. Dec 8, 2007 #4
    They also pretty clearly intersect at 0.
  6. Dec 8, 2007 #5
    ok so now how do i get started with that
  7. Dec 8, 2007 #6
    Actually, I wasn't paying attention. How did you get 9.24 as an intersection point? They intersect at x = 0 and x = 1. Those are the limits of integration that are desired I imagine.
  8. Dec 9, 2007 #7
    yea i dont even no where the 9.24 came from.. so i do it from x=0 to x=1 and what is the top and bottom values??
  9. Dec 9, 2007 #8


    User Avatar
    Homework Helper

    Uh, I didn't sketch the graph when I did this, but isn't x=-1 also a possible intersection point?
  10. Dec 9, 2007 #9


    User Avatar
    Science Advisor

    One of the very first things you should have learned is that two curves intersect where the same x-value gives the same y-value.

    The graphs of y = x^5 - 2ln(x+5) and y = x^3 - 2ln(x+5) intersect where
    y= x^5- 2ln(x+5)= x^3- 2ln(x+5). Can you solve that equation?
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook