Question

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

Answer 1

`f(3)=5`

Explanation:

Simply substitute the value of `3` given. In other words, `f(3)` is the function of `f(x)`, however, in this case, `x` is `3`

`f(3)=3(3)-4`

Distribute `3` through the parenthesis

`f(3)=9-4`

Simplify

`f(3)=5`

Answer 2

`f(3)= 5`

Explanation:

How you start the equation is by plugging `3` into both of the `x`'s in the problem to make it:

`f(3) = 3(3) - 4`

Next, you multiply the `3(3)` to get `9` and subtract `4`. So in the end, you leave the `f(3)` and `9 -`4 is `5`, so the `y` in the equation is `5`.

The answer would be written as

`f(3) = 5`