# Given the function f(r)=sqrt(r+1)-5, what is f(x-1)?

Dec 28, 2016

$f \left(x - 1\right) = \sqrt{x} - 5$

#### Explanation:

$f \left(r\right) = \sqrt{r + 1} - 5$

$f \left(x - 1\right) \text{ }$ means replace every $r$ by $\left(x - 1\right)$

$f \left(x - 1\right) = \sqrt{x - 1 + 1} - 5$

$f \left(x - 1\right) = \sqrt{x} - 5$