Question

How do you evaluate functions?

Answer 1

Assuming your function is expressed using `x` as a variable, evaluation of the function involves replacing each occurrence of `x` with some per-specified value.

That is evaluation of a function is always "at some point#.

For example if your function is
`f(x) = 3x^2 -x +4`
and you are asked to evaluate this function at `x=2`

`f(2) = 3(2^2) -2 + 4 = 14`

(Since this question was asked under "Functions in Slope-Intercept Form, your function might look more like:
`y = 5x + 7`
and you might be asked to "evaluate `y` at `2`", but the same idea applies:
`y = 5(2) + 7 = 17` )