Question

If `f(x) = -6x - 3`, then how do you find f(2)?

Answer 1

`f(2)=-15`

Explanation:

Substitute `2` instead of `x` into your function so you get:
`f(2)=(-6*2)-3=-12- 3=-15`

Answer 2

Replace every `x` with `2` and do the arithemetic.

Explanation:

In the definition of this function the variable `x` is a name for the blank space. (Definition for the rest of this one problem, not for other problems too.)

`fcolor(red)((x)) = -6 color(red)((x)) -3`

To find `f(2)`, replace all of the `x`'swith `2` and do the arithmetic.

`fcolor(red)((2)) = -6 color(red)((2)) -3`

Now we do the arithmetic:

`f(2) = -6(2) -3 = -12 - 3 = -15`

Here's another example: for the same `f`, find `f(-5)`

Solution:
`fcolor(red)((-5)) = -6 color(red)((-5)) -3`

`= 30-3`
`= 27`