Question 323848
You are correct to divide both sides by 49, in order to set the equation equal to 1.  Then, in the y portion of the equation, you have to invert the 2 coefficient.  So in this ellipse, a^2=49 and b^2 = 49/2.  The larger of these two is a=7, so the major diameter is 14.


Dr. Robert J. Rapalje, Retired
Seminole State College of Florida
Altamonte Springs Campus