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September 2, 2014

September 2, 2014

Posted by **Anonymous** on Saturday, January 12, 2013 at 12:40am.

nd 16x^2+25y^2=400,

then

find

PF1+PF2.

- maths -
**Reiny**, Saturday, January 12, 2013 at 9:07am16x^2+25y^2=400 or

x^2/25 + y^2/16 = 1

you have an ellipse where a=5 and b=4

looks like you want the sum of the the two distances from any point on the ellipse to the two focal points.

By definition that is 2a

= 10

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