Given {eq}f(x) = x^2 - 3x + 4, {/eq} find f(2).

## Question:

Given {eq}f(x) = x^2 - 3x + 4, {/eq} find f(2).

## Evaluating a Function

A function is a rule that takes an input and assigns an output to it. We can express this rule in a wide variety of ways, but one of the most common ways is as {eq}y = f(x) {/eq}. If we have a function in this form, we can evaluate it at any value of x in the domain to find the corresponding function value.

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Chapter 1 / Lesson 8Function notation is a mathematical concept that deals with displaying a system of symbols. Discover the definition and examples of function notation, as well as how to write it, how to evaluate functions, and how to combine two functions in function composition.