A common tangent to x^(2) - 2y^(2) =18 a...

A common tangent to `x^(2) - 2y^(2) =18` and `x^(2) + y^(2) = 9` is

A

`y = 2x + 3 sqrt5`

B

`y= sqrt2x+ 3 sqrt3`

C

`y= 2x+ 3 sqrt7`

D

`y= sqrt2x+ 3 sqrt5`

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The correct Answer is:

B

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