To evaluate a function is to: Replace (substitute) any variable with its given number or expression. Like in this example:

Evaluating a function means to find a y-value for a specific x-value. For example, if you have the function f (x) = 2x, evaluating the function for x = 2 results in a y-value of 2* (x) = 4.

Dec 15, 2024 · While the notation and wording is different, the process of evaluating a function is the same as evaluating an equation: in both cases, you substitute 2 for x, multiply it by 4 and …

Sometimes when mapping between an input and output, the input can be another function that maps to another input. This is called a composite function. When evaluating a composite …

In the following video we offer more examples of evaluating a function for specific x values.

Dec 9, 2025 · Today we are going to take a look at evaluating functions and expressions. All this requires is plugging in different values for variables and simplifying. Let’s start with a super …

Jan 5, 2024 · When we evaluate a function, the objective is to find the corresponding output (y-value) given an input (x-value). Keep in mind that we can denote this relationship as y = f (x), …

To evaluate an equation at a given value, you plug that value in for the specified variable; then simplify to find the value of the other variable.

How do you evaluate functions? The same way that you substitute values into equations! Example 1 What is the value of $$ x $$ given the equation $$ y = 2x $$ when $$ x = 5 $$? …

You can use an online graphing calculator to graph functions, find function values, and evaluate functions. Watch this short tutorial to learn how to within Desmos.