If a line x + 2y = k touches tot he ell...

If a line ` x + 2y = k` touches tot he ellipse ` ( x^(2))/( 9) + (y^(2))/( 4) = 1 ` then find k

A

`k = pm 2 `

B

` k = pm 5`

C

` k = 25`

D

` k = - 25`

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