Question

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

Answer 1

`f(-1)=-5`

Explanation:

`f(r)=sqrt(r+1)`

`f(-1) = sqrt(-1+1)-5`

`f(-1)=sqrt0-5`

`f(-1)=0-5`

`f(-1)=-5`