Results 1 to 3 of 3

Math Help - Conics!!!

  1. #1
    Kal
    Kal is offline
    Newbie
    Joined
    Jan 2008
    Posts
    3

    Conics!!!

    Hi, I need some help with this math problem:


    Given the general form of a conic 2x^2+C y^2 +8x -y +F = 0 .
    What would be the values of C and F that make the conic a parabola opening upward with
    its vertex at (-2,1) ? Given the equation of this conic.

    Please someone help me!.
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Flow Master
    mr fantastic's Avatar
    Joined
    Dec 2007
    From
    Zeitgeist
    Posts
    16,948
    Thanks
    5
    Quote Originally Posted by Kal View Post
    Hi, I need some help with this math problem:


    Given the general form of a conic 2x^2+C y^2 +8x -y +F = 0 .
    What would be the values of C and F that make the conic a parabola opening upward with
    its vertex at (-2,1) ? Given the equation of this conic.

    Please someone help me!.
    It should be clear that C = 0.

    Then y = 2x^2 + 8x + F = 2(x^2 + 4x + F/2) = 2([x + 2]^2 - 4 + F/2) = 2[x + 2]^2 - 8 + F.

    Threfore - 8 + F = 1 (why?). Therefore F = 9.
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Kal
    Kal is offline
    Newbie
    Joined
    Jan 2008
    Posts
    3
    awesome!!! thanks a lot!
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. TI 84 Plus Conics app?
    Posted in the Calculators Forum
    Replies: 1
    Last Post: March 6th 2010, 06:27 AM
  2. conics
    Posted in the Geometry Forum
    Replies: 1
    Last Post: February 24th 2010, 10:17 AM
  3. Conics
    Posted in the Pre-Calculus Forum
    Replies: 2
    Last Post: September 18th 2007, 05:02 AM
  4. Conics
    Posted in the Pre-Calculus Forum
    Replies: 2
    Last Post: September 1st 2007, 11:26 AM
  5. Replies: 2
    Last Post: August 28th 2007, 01:55 PM

Search Tags


/mathhelpforum @mathhelpforum