Question

How do you find `f(-4)` when `f(x)=8x+11`?

Answer 1

See the entire solution process below:

Explanation:

To find `f(-4)`, substitute `color(red)(-4)` for every occurrence of `color(red)(x)` in the function `f(x)`:

`f(color(red)(x)) = 8color(red)(x) + 11` becomes:

`f(color(red)(-4)) = (8 xx color(red)(-4)) + 11`

`f(color(red)(-4)) = -32 + 11`

`f(color(red)(-4)) = -21`