Question

How do you find the value of f(-1), if `f(x)=3x-4`?

Answer 1

See the entire solution process below:

Explanation:

To evaluate `f(-1)` we must substitute `color(red)(-1)` for every occurrence of `color(red)(x)` in the function `f(x)`:

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

`f(color(red)(-1)) = (3 xx color(red)(-1)) - 4`

`f(color(red)(-1)) = -3 - 4`

`f(color(red)(-1)) = -7`