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!

Finding Integralsany help please!

  1. Sep 14, 2013 #1
    Hi, can anyone help please as I'm getting tied up in knots...

    1. The problem statement, all variables and given/known data

    Integrate (5x^2 + √x - 4/x^2) dx

    2. Relevant equations

    I think this is differentiating by parts...

    3. The attempt at a solution

    So far I've got to: 5x^3 / 3 + 2x^3/2 / 3 + 4 / x +c

    I can't think how I can make it any tidier so any tips would be really appreciated!
     
  2. jcsd
  3. Sep 14, 2013 #2

    phyzguy

    User Avatar
    Science Advisor

    Two questions for you:

    (1) What is:
    [tex]\int( f(x) + g(x)) dx[/tex]
    (2) What is:
    [tex]\int x^k dx[/tex]
     
  4. Sep 14, 2013 #3

    SteamKing

    User Avatar
    Staff Emeritus
    Science Advisor
    Homework Helper

    Question (3): What is 'differentiating by parts'?
     
  5. Sep 14, 2013 #4

    Ray Vickson

    User Avatar
    Science Advisor
    Homework Helper

    Because you do not use parentheses, I cannot figure out whether you mean
    [tex] (1) \; \int \left(5 x^2 + \sqrt{x} - \frac{4}{x^2} \right) \, dx \leftarrow \text{ what you wrote}[/tex]
    or
    [tex] (2) \; \int \left( 5 x^2 + \sqrt{x - \frac{4}{x^2}} \right) \, dx [/tex]
    or
    [tex] (3) \;\int \left(5 x^2 - \frac{ \sqrt{x-4}}{x^2} \right)\, dx [/tex]
    or
    [tex] (4) \;\int \left(5 x^2 - \sqrt{ \frac{x-4}{x^2} } \right)\, dx [/tex]
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted



Similar Discussions: Finding Integralsany help please!
Loading...