# How to solve domain and range

## Domain and Range of a Function One way of finding the range of a rational function is by finding the domain of the in the domain of the function, equate the denominator to zero and solve for x.

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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.

Another way to identify the domain and range of functions is by using graphs. Because the domain refers to the set of possible input values, the domain of a graph consists of all the input values shown on the x -axis. The range is the set of possible output values, which are shown on the y -axis. Keep in mind that if the graph continues beyond the portion of the graph we can see, the domain and range may be greater than the visible values. See Figure 6. Note that the domain and range are always written from smaller to larger values, or from left to right for domain, and from the bottom of the graph to the top of the graph for range. Figure 9.

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 all content Functions Determining the range of a function Algebra 2 level. Domain and range of quadratic functions. Range of quadratic functions. Practice: Range of quadratic functions. Next lesson.

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.
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The 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. So, the range of the function is the set of real numbers except 0. To find the excluded value in the domain of the function, equate the denominator to zero and solve for x.

## Domain and Range of Rational Functions

Finding Domain and Range. Learning Objective s. Functions are a correspondence between two sets, called the domain and the range. When defining a function, you usually state what kind of numbers the domain x and range f x values can be. There may be restrictions on the domain and range. The restrictions partly depend on the type of function. In this topic, all functions will be restricted to real number values.

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Discusses the domain and range of a function, and how to find the domain and range So I'll set the denominator equal to zero and solve; my domain will be.
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