Results 1 to 3 of 3

Math Help - Help with Ellipse Problem

  1. #1
    Newbie
    Joined
    Jun 2007
    Posts
    10

    Unhappy Help with Ellipse Problem

    The Ellipse (x^2/9)+(y^2/16)=1 is _________

    A) A vertical ellipse with foci at (0, +-sqroot7)
    B) A horizontal ellipse with foci at (+-sqroot7, 0)
    C) An ellipse with a minor axis of length 8
    D) An ellipse with a major axis of length 6

    thanks
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Super Member

    Joined
    May 2006
    From
    Lexington, MA (USA)
    Posts
    11,751
    Thanks
    651
    Hello, Andy!

    We can "eyeball" the equation . . .


    The ellipse . \frac{x^2}{9}+ \frac{y^2}{16} \:=\:1 .is:

    (A) A vertical ellipse with foci at (0,\,\pm\sqrt{7})
    (B) A horizontal ellipse with foci at (\pm\sqrt{7},\,0)
    (C) An ellipse with a minor axis of length 8
    (D) An ellipse with a major axis of length 6

    We see that the major (longer) axis is in the y-direction, a "vertical" ellipse.
    . . The length of the major axis is 8; the minor axis has length 6.

    This eliminates answer-choices (B),\,(C),\,(D)

    Follow Math Help Forum on Facebook and Google+

  3. #3
    Newbie
    Joined
    Jun 2007
    Posts
    10
    thanks
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. ellipse problem
    Posted in the Geometry Forum
    Replies: 0
    Last Post: November 22nd 2010, 08:33 AM
  2. Ellipse problem
    Posted in the Geometry Forum
    Replies: 1
    Last Post: March 30th 2010, 08:09 PM
  3. Ellipse problem
    Posted in the Calculus Forum
    Replies: 4
    Last Post: January 7th 2010, 08:16 PM
  4. ellipse problem
    Posted in the Pre-Calculus Forum
    Replies: 1
    Last Post: March 16th 2009, 10:04 AM
  5. ellipse problem
    Posted in the Pre-Calculus Forum
    Replies: 1
    Last Post: February 1st 2007, 08:43 AM

Search Tags


/mathhelpforum @mathhelpforum