# If f(x)=(x-2)/(x+1), then f(n+1) is equal to what?

$f \left(n + 1\right) = \frac{n - 1}{n + 2}$
$f \left(n + 1\right) \text{ }$ means replace all the $x s \text{ }$with $\text{ } n + 1$
$f \left(n + 1\right) = \frac{n + 1 - 2}{n + 1 + 1}$
$f \left(n + 1\right) = \frac{n - 1}{n + 2}$