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The eccentricity of the ellispse (x -3)...

The eccentricity of the ellispse ` (x -3)^(2) + ( y-4)^(2) = y^(2)/9` is

A

`(sqrt(3))/(2)`

B

`(1)/(3)`

C

`(1)/(3sqrt(2))`

D

`(1)/(sqrt(3))`

Text Solution

Verified by Experts

The correct Answer is:
B
`9(x-3)^(2) +9(y-4)^(2) =y^(2)`
`rArr 9(x-3)^(2) + 8y^(2) - 72y +144 =0`
`rArr 9 (x-3)^(2) + 8(y^(2) -9y) +144 =0`
`rArr 9 (x-3)^(2) + 8 [(y-(9)/(2))^(2)-(81)/(4)] +144 =0`
`rArr 9(x-3)^(2) + 8 (y-(9)/(2))^(2) = 162- 144 = 18`
`rArr(9(x-3)^(2))/(18) +(8(y-(9)/(2)))/(18) =1`
`rArr ((x-3)^(2))/(2) + ((y-(9)/(2)))/(9//4) =1`
`rArr e^(2) = 1 -(2xx 4)/(9) = (1)/(9) rArr e = (1)/(3)`
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