Results 1 to 1 of 1

Math Help - Range of Y question

  1. #1
    Newbie
    Joined
    Dec 2007
    Posts
    3

    Question Range of Y question

    Hello, I wonder if anyone can help me, would be very grateful if anyone could.

    If you wanted to find the range of a curve say y=(2x^2
    + 5x+3)/(4x^2 + 5x +3) instead of using calculus to find the stationary points and then subing back in to find e.g. the min. value of y or whatever, you can rearrange :

    (4y-2)x^2 + (5y-5)x + 3y-3 =0 and then using b^2 - 4ac>0 to find the possible range...

    just wondered...when does this method fail? It failed when I tried to use it for some other questions like y=[(x-1)(3x+2)]/[(x+1)^2] and pretty certain I didn't make any algebraic slip ups there.

    Anyways, thanks

    Jess x
    Last edited by Jess89; December 29th 2007 at 01:09 PM.
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. [SOLVED] Domain and Range question
    Posted in the Pre-Calculus Forum
    Replies: 5
    Last Post: October 16th 2011, 12:39 PM
  2. range question
    Posted in the Pre-Calculus Forum
    Replies: 1
    Last Post: March 8th 2011, 01:49 PM
  3. Range of Values Question
    Posted in the Trigonometry Forum
    Replies: 3
    Last Post: January 31st 2011, 11:20 AM
  4. Range trick question?
    Posted in the Pre-Calculus Forum
    Replies: 6
    Last Post: February 10th 2010, 05:50 PM
  5. domain and range question
    Posted in the Algebra Forum
    Replies: 3
    Last Post: October 9th 2007, 06:14 PM

Search Tags


/mathhelpforum @mathhelpforum