Results 1 to 11 of 11

Math Help - Function domain

  1. #1
    Junior Member
    Joined
    May 2009
    Posts
    27

    Function domain

    \frac{x^3-3x^2+1}{x^3}
    Would the domain of this function be
    y defined for all x
    and for all x not equal to 0
    Follow Math Help Forum on Facebook and Google+

  2. #2
    No one in Particular VonNemo19's Avatar
    Joined
    Apr 2009
    From
    Detroit, MI
    Posts
    1,823
    All x not equal to 0! right you are sir!

    And do you know why?
    Last edited by VonNemo19; May 17th 2009 at 01:01 PM. Reason: forgot something
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Junior Member
    Joined
    May 2009
    Posts
    27
    Quote Originally Posted by VonNemo19 View Post
    All x not equal to 0! right you are sir!

    And do you know why?
    0 can't be used with an exponent?
    Follow Math Help Forum on Facebook and Google+

  4. #4
    Member
    Joined
    Apr 2009
    Posts
    166
    Quote Originally Posted by anon_404 View Post
    0 can't be used with and exponent?
    That's only true for exponents < 0

    What's \frac 1{0}?
    Follow Math Help Forum on Facebook and Google+

  5. #5
    Junior Member
    Joined
    May 2009
    Posts
    27
    Quote Originally Posted by derfleurer View Post
    That's only true for exponents < 0

    What's \frac 1{0}?
    0?
    Follow Math Help Forum on Facebook and Google+

  6. #6
    Member
    Joined
    Apr 2009
    Posts
    166
    If \frac {10}5 = 2 than working backwards 2 * 5 = 10

    So if \frac 10 = 0 than how is it that 0 * 0 = 1?
    Follow Math Help Forum on Facebook and Google+

  7. #7
    Junior Member
    Joined
    May 2009
    Posts
    27
    not possible to /0?
    Follow Math Help Forum on Facebook and Google+

  8. #8
    Member
    Joined
    Apr 2009
    Posts
    166
    In basic arithmetic division by zero is meaningless. So for a function like y = \frac 1x, we simply say that @ x = 0, y is undefined. This is also the case in your original equation.
    Follow Math Help Forum on Facebook and Google+

  9. #9
    No one in Particular VonNemo19's Avatar
    Joined
    Apr 2009
    From
    Detroit, MI
    Posts
    1,823
    How can you divide by nothing? See what I'm driving at?
    Follow Math Help Forum on Facebook and Google+

  10. #10
    Newbie
    Joined
    May 2009
    Posts
    1
    i think the domain would be x
    Follow Math Help Forum on Facebook and Google+

  11. #11
    Member
    Joined
    Apr 2009
    Posts
    166
    Yes, the intent was for what values of our domain is our range defined.
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. domain of function
    Posted in the Algebra Forum
    Replies: 2
    Last Post: January 21st 2010, 12:57 PM
  2. Domain of the Function
    Posted in the Pre-Calculus Forum
    Replies: 1
    Last Post: October 6th 2009, 03:11 PM
  3. Domain of a Function
    Posted in the Pre-Calculus Forum
    Replies: 4
    Last Post: September 30th 2009, 10:51 PM
  4. help with the domain of the function
    Posted in the Pre-Calculus Forum
    Replies: 8
    Last Post: February 17th 2009, 05:09 PM
  5. domain of a function
    Posted in the Algebra Forum
    Replies: 3
    Last Post: August 17th 2008, 05:38 PM

Search Tags


/mathhelpforum @mathhelpforum