Question

If `F(x)=(33-x)/(x-1)`, what is `F(9)`?

Answer 1

`F(9)` is the value of the function `F(x)` when `x` is replaced in the expression for `F(x)` with `9` and the expression is simplified.

Explanation:

For example if
`color(white)("XXX")F(x) = (33-x)/(x-1)`
then
`color(white)("XXX")F(9)=(33-9)/(9-1) = 24/8 = 3`

Note that although I have used `x` as the variable in the defining expression for `F(x)` any variable could have been used. For the given example
`color(white)("XXX")F(x)=(33-x)/(x-1)`
is exactly equivalent to
`color(white)("XXX")F(t)=(33-t)/(t-1)`
and
`color(white)("XXX")F(9)` would still have the same value.