If you're talking about evaluating functions, then it works the exact same way as evaluating algebraic expressions. Replace all instances of the variable with its substituted value, and …

Sal uses function notation to help Frank figure out how much water he can put in his balloon. Created by Sal Khan.

About this unit A function is like a machine that takes an input and gives an output. Let's explore how we can graph, analyze, and create different types of functions. Unit guides are here! …

Evaluate functions for specific inputs given the formula of the function. Functions are written using function notation.

Learn how to interpret expressions that contain a function within a real-world context. In this video, the function we interpret models an account balance over time.

If you've seen the earlier videos, you will understand that functions simply generate an output from an input. Thus, there are infinite applications - it's used anytime there is a correlation …

Use the vertical line test to determine if the graph is a function. If you can draw a vertical line anywhere in the coordinate plane and the line only crosses the graph once, then the graph is a …

We can describe sums with multiple terms using the sigma operator, Σ. Learn how to evaluate sums written this way. Summation notation (or sigma notation) allows us to write a long sum in …

Rearranging to solve for the variable you want to measure, you get a function (as long as there's not multiple outputs for any input)! Functions involve anything with an independent and …

The first concept to know is the f (x) and Y refer to the same thing. F (x) is Y. So, if you have an equation that you want to change to function notation, you: 1) Solve the equation for Y 2) Then …