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April 24th, 2012, 04:15 AM  #1 
Newbie Joined: Apr 2012 Posts: 1 Thanks: 0  Ellipse question
Hi i am new to this forum, and the main reason that i joined here is that my maths is very weak. I wanted to know if any of you could provide me with valuable tips to improve on my maths. here is the question btw. if P is a point on the ellipse, x^2/16 + y^2/20 =1 . whose focii are S and S' then find PS + PS' i would be grateful if someone could answer both my queries. thanks 
April 24th, 2012, 05:12 AM  #2  
Senior Member Joined: Dec 2011 Posts: 277 Thanks: 1  Re: Ellipse question
An ellipse is defined by two points, each called a focus. (F1, F2). If you take any point on the ellipse, the sum of the distances to the focus points is a constant. The general formula for an ellipse with its major axis parallel to the vertical axis has the form where If P is a point on the ellipse whose foci are F1 and F2 then In our case we have Thus, and Quote:
 

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