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If f(x) = (x- 1)/( x + 1) , then f (2 ...

If ` f(x) = (x- 1)/( x + 1)` , then f (2 x) is

A

`(f(x) +1)/( f(x)+3)`

B

`(3 f(x)+1)/(f(x) + 3)`

C

`(f(x) + 3)/( f(x)+1)`

D

`(f(x) + 3)/( 3 f (x) + 1)`

Text Solution

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The correct Answer is:
B
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