When we talk about functions in algebra, two really important ideas are domain and range.

Domain is all about the input values, which are usually the $x$ values. Think of it as the set of numbers you’re allowed to use in a function.

For example, if you have a function like $f(x) = \sqrt{x}$, the domain only includes numbers that are zero or greater. So, you could say $x$ has to be $0$ or more.

Now, let’s talk about range. This is about the output values, or the $y$ values you get after using the function. In our example of $f(x) = \sqrt{x}$, the range would also be $y \geq 0$, meaning you can only get zero or positive values.

Understanding domain and range is really helpful. They help you figure out what values you can use in your function and what results you can expect.

It’s like having rules to follow, so you stay in the right area. Knowing these concepts is super important for graphing functions and solving real-life problems. Being clear about domain and range makes a big difference when you’re learning more advanced math!