# How do you find determine the domain of a function?

## How do you find determine the domain of a function?

The domain of a function is the set of all possible inputs for the function. For example, the domain of f(x)=x² is all real numbers, and the domain of g(x)=1/x is all real numbers except for x=0. We can also define special functions whose domains are more limited.

How do you determine the domain of rational functions and expressions?

In the case of rational expressions, we can input any value except for those that make the denominator equal to 0 (since division by 0 is undefined). In other words, the domain of a rational expression includes all real numbers except for those that make its denominator zero.

How do you identify the domain and range of a graph?

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.

### What is rational algebraic equation?

A rational equation is an equation containing at least one fraction whose numerator and denominator are polynomials, These fractions may be on one or both sides of the equation. A common way to solve these equations is to reduce the fractions to a common denominator and then solve the equality of the numerators.

What is domain and range of a graph?

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.

How to find the domain of a rational function?

To find these x values to be excluded from the domain of a rational function, equate the denominator to zero and solve for x . For example, the domain of the parent function f x = 1 x is the set of all real numbers except x = 0 .

#### How to find the range of a rational function?

One way of finding the range of a rational function is by finding the domain of the inverse function. Another way is to sketch the graph and identify the range. Let us again consider the parent function f x = 1 x . We know that the function is not defined when x = 0 . As x → 0 from either side of zero, f x → ∞ .

How to find the domain of a radical function?

Example 2: Find the domain and range of the radical function The acceptable values under the square root are zero and positive numbers. So I will let the “stuff” inside the radical equal or greater than zero, and then solve for the required inequality. Now, the domain of the function is x ≤ 5.

How to draw a graph with a rational function?

How To: Given a rational function, sketch a graph. Evaluate the function at 0 to find the y -intercept. Factor the numerator and denominator. For factors in the numerator not common to the denominator, determine where each factor of the numerator is zero to find the x -intercepts. 11/10/2020