Results 1 to 6 of 6

Math Help - domain of functions 2

  1. #1
    Newbie
    Joined
    Jan 2010
    Posts
    17

    domain of functions 2

    how do you find the domain of the function f(x)=x-4 over 2xsquared-x-3
    Follow Math Help Forum on Facebook and Google+

  2. #2
    is up to his old tricks again! Jhevon's Avatar
    Joined
    Feb 2007
    From
    New York, USA
    Posts
    11,663
    Thanks
    3
    Quote Originally Posted by bastropgarl View Post
    how do you find the domain of the function f(x)=x-4 over 2xsquared-x-3
    this rational function is defined where the denominator is non-zero (you can never divide by zero). So, for what x-values is the denominator equal to zero? (the domain is all x-values but those)
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Newbie
    Joined
    Jan 2010
    Posts
    17
    so for this question i got the domain as x>4. Is that correct?
    Follow Math Help Forum on Facebook and Google+

  4. #4
    is up to his old tricks again! Jhevon's Avatar
    Joined
    Feb 2007
    From
    New York, USA
    Posts
    11,663
    Thanks
    3
    Quote Originally Posted by bastropgarl View Post
    so for this question i got the domain as x>4. Is that correct?
    um, no. how'd you get that? do you know what the denominator is?
    Follow Math Help Forum on Facebook and Google+

  5. #5
    Newbie
    Joined
    Jan 2010
    Posts
    17
    yes i know what the denominator is...but not sure how to find the domain. I got x>4 by trying different numbers into the x place till i got a number > than 0
    Follow Math Help Forum on Facebook and Google+

  6. #6
    is up to his old tricks again! Jhevon's Avatar
    Joined
    Feb 2007
    From
    New York, USA
    Posts
    11,663
    Thanks
    3
    Quote Originally Posted by bastropgarl View Post
    yes i know what the denominator is...but not sure how to find the domain. I got x>4 by trying different numbers into the x place till i got a number > than 0
    that is not what i told you to do. set the denominator equal to zero and solve. your domain is all x values except the ones you get from doing that. getting something > 0 is not the issue here. i never said it was. we want the denominator to not be zero. this is not an inequality
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. domain of functions 1
    Posted in the Algebra Forum
    Replies: 4
    Last Post: January 21st 2010, 01:29 PM
  2. domain of functions 3
    Posted in the Algebra Forum
    Replies: 1
    Last Post: January 21st 2010, 01:26 PM
  3. domain of functions 4
    Posted in the Algebra Forum
    Replies: 6
    Last Post: January 21st 2010, 01:24 PM
  4. Domain Of Functions
    Posted in the Algebra Forum
    Replies: 6
    Last Post: November 6th 2009, 05:24 PM
  5. Functions, Domain & Range
    Posted in the Discrete Math Forum
    Replies: 2
    Last Post: April 30th 2008, 09:24 AM

Search Tags


/mathhelpforum @mathhelpforum