Question

What is the value of f(5) for the function f(x) = 3x - 4?

Answer 1

See a solution process below:

Explanation:

To find `f(5)` substitute `color(red)(5)` for each occurrence of `color(red)(x)` in `f(x)`:

`f(color(red)(x)) = 3color(red)(x) - 4` becomes:

`f(color(red)(5)) = (3 xx color(red)(5)) - 4`

`f(color(red)(5)) = 15 - 4`

`f(color(red)(5)) = 11`