Скачать или смотреть What Does It Mean: Domain & Range of Functions Explained Simply

Understanding the domain and range of a function is one of the most important skills in algebra and precalculus. But many students struggle with these concepts—what they really mean, how to find them, and why they matter. In this video, we break it all down step by step so you’ll never be confused again. So, when you ask yourself “Domain & Range of a Function—what does it mean?”, this lesson will give you the full answer.

We’ll start by defining domain as the complete set of all possible input values (the x-values you can plug into a function). Then we’ll move on to the range, which is the set of all possible output values (the y-values that come out of the function). These two ideas are fundamental in mathematics because they tell us the limits, restrictions, and behavior of a function.

👉 In this video, you’ll learn:

The formal definition of domain and range.

How to identify domain restrictions caused by division by zero and square roots of negative numbers.

Step-by-step examples with linear, quadratic, rational, and radical functions.

How to write domain and range in interval notation and set-builder notation.

The connection between graphs and equations when finding domain and range.