Let f(x)= x-1 x+1 , then f(f(x)) is: - Vidyadip

MCQ

Let $\text{f(x)}=\frac{\text{x}-1}{\text{x}+1},$ then $f(f(x))$ is:

A
$\frac{1}{\text{x}}$
✓
$-\frac{1}{\text{x}}$
C
$\frac{1}{\text{x}+1}$
D
$\frac{1}{\text{x}-1}$

✓

Answer

Correct option: B.

$-\frac{1}{\text{x}}$

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