Results 1 to 3 of 3

Math Help - Functions and graphs

  1. #1
    Junior Member
    Joined
    Sep 2008
    Posts
    64

    Functions and graphs

    Question: If f(x) = -1, what is x? what point(s) are on the graph of f?

    f(x) = 2x^2 -x -1

    Is x 0? How am I suppose to get the points? :/
    Follow Math Help Forum on Facebook and Google+

  2. #2
    MHF Contributor
    skeeter's Avatar
    Joined
    Jun 2008
    From
    North Texas
    Posts
    12,056
    Thanks
    894
    Quote Originally Posted by cokeclassic View Post
    Question: If f(x) = -1, what is x? what point(s) are on the graph of f?

    f(x) = 2x^2 -x -1

    Is x 0? How am I suppose to get the points? :/
    2x^2 - x - 1 = -1

    2x^2 - x = 0

    x(2x - 1) = 0

    x = 0 and x = \frac{1}{2}

    so, the points on the graph where f(x) = -1 are (0, -1) and (1/2, -1)
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Junior Member
    Joined
    Sep 2008
    Posts
    64
    thanks
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. [SOLVED] Sum of two functions (graphs)
    Posted in the Pre-Calculus Forum
    Replies: 3
    Last Post: July 18th 2011, 07:26 PM
  2. functions & graphs
    Posted in the Pre-Calculus Forum
    Replies: 1
    Last Post: May 7th 2010, 01:24 PM
  3. Functions and graphs
    Posted in the Calculus Forum
    Replies: 3
    Last Post: January 16th 2009, 10:26 AM
  4. Functions and their graphs
    Posted in the Pre-Calculus Forum
    Replies: 1
    Last Post: December 16th 2008, 10:50 PM
  5. Functions and Their Graphs
    Posted in the Trigonometry Forum
    Replies: 2
    Last Post: July 17th 2008, 12:55 AM

Search Tags


/mathhelpforum @mathhelpforum