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April 24th, 2012, 03:15 AM   #1
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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
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April 24th, 2012, 04:12 AM   #2
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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:
Originally Posted by indianmathnoob
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.
My advice is don't be afraid to ask questions!
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