Question

Given the function `f(r)=sqrt(r+1)-5`, what is f(63)?

Answer 1

`color(green)(f(63)=3`

Explanation:

If `f(color(red)r)=sqrt(color(red)r+1)-5`
then
`f(color(red)(63))=sqrt(color(red)(63)+1)-5`

`color(white)("XXX")=sqrt(64)-5`

`color(white)("XXX")=8-5`

`color(white)("XXX")=3`