Question

What is eccentricity of the ellipse given by the equation x^2/49 + y^2/81 =1? .63 or .81

Answer 1

http://www.wolframalpha.com/input/?i=+What+is+eccentricity+of+the+ellipse+given+by+the+equation+x%5E2%2F49+%2B+y%5E2%2F81+%3D1

Answer 2

isnt e = c/a?

Answer 3

yes it is but im still confused...

Answer 4

well, the major axis is the larger value; and c is the focal length

Answer 5

sqrt(1-49/81)

Answer 6

they tend to be situated like this

Answer 7

the equation gives us a and b; we would need to find c

Answer 8

You don't need c if you have a and b

Answer 9

sqrt(1-49/81) = 0.6285

Answer 10

doesnt c = sqrt(a^2-b^2) ?

Answer 11

thank you

Answer 12

Yes, it is same thing just rearranged....

Answer 13

e= sqrt(1-b^2/a^2) a>b

Answer 14

then finding c is just a part of the overall process. you still need to find "c" :)

sqrt(a^2-b^2)/sqrt(a^2) .... simplifies to your results. yes