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Find k , if the line y = 2x + k touches ...

Find k , if the line y = 2x + k touches the circle ` x^(2) + y^(2)`
` - 4x - 2y =0 `

A

`1 lt r lt 7`

B

`3 lt r lt 10 `

C

`2 lt r lt 9`

D

`2 lt r lt 8 `

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