# State the domain and range

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Simple explanation for domain and range. We learn the domain of a function is the set of possible x-values and the range is the resulting set of.

and youThe domain of a rational function consists of all the real numbers x except those for which the denominator is 0. To find these x values to be excluded from the domain of a rational function, equate the denominator to zero and solve for x. One way of finding the range of a rational function is by finding the domain of the inverse function. The graph approaches x -axis as x tends to positive or negative infinity, but never touches the x -axis. That is, the function can take all the real values except 0.

By using our site, you acknowledge that you have read and understand our Cookie Policy , Privacy Policy , and our Terms of Service. Mathematics Stack Exchange is a question and answer site for people studying math at any level and professionals in related fields. It only takes a minute to sign up. State the domain and range of the following graphs. Express each domain using interval notation and express each range using set-builder notation. I think I'm beginning to understand using interval notation and set builder notation, but I'm still having trouble with the endpoints. Sign up to join this community.

Another way to identify the domain and range of functions is by using graphs.

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Easy to understand math lessons on DVD. Try before you commit. The domain of a function is the complete set of possible values of the independent variable. The domain is the set of all possible x -values which will make the function "work", and will output real y -values. This will make the number under the square root positive. In general, we determine the domain of each function by looking for those values of the independent variable usually x which we are allowed to use. Usually we have to avoid 0 on the bottom of a fraction, or negative values under the square root sign.

If you're seeing this message, it means we're having trouble loading external resources on our website. To log in and use all the features of Khan Academy, please enable JavaScript in your browser. Math Algebra I Functions Introduction to the domain and range of a function. Intervals and interval notation. What is the domain of a function? What is the range of a function?

The domain of a function f x is the set of all values for which the function is defined, and the range of the function is the set of all values that f takes. In grammar school, you probably called the domain the replacement set and the range the solution set. They may also have been called the input and output of the function. D is not in the domain, since the function is not defined for D. You can also talk about the domain of a relation , where one element in the domain may get mapped to more than one element in the range. Here, the relation is given as a set of ordered pairs. Note that the domain elements 1 and 2 are associated with more than one range elements, so this is not a function.

## Domain and Range of Rational Functions

Find the Domain and Range from a Graph

Discusses the domain and range of a function, and how to find the domain and range from a list of points or from a graph.

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## 4 thoughts on “State the domain and range”

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All of the values that can go into a relation or function input are called the domain.