October 15, 2008

This resource has been contributed by Winpossible, and can also be accessed on their website by clicking here - Finding the domain of function.

This mini-lesson explains how to find a function's domain from its equation. If a function f is defined by an expression with variable x, then the domain is the set of all real numbers that can be substituted for x such that the resulting value of the function is a real number. E.g. if we've to find the domain of the function f(x) = x + 3, you can see that there is no restriction on x as all values of x as long as it is a real number, lead to a real number for f(x). Hence, the domain of this function is the set of all real numbers. Also, the set of all correspondence values of f(x) is called range.

This mini-lesson explains how to find a function's domain from its equation. If a function f is defined by an expression with variable x, then the domain is the set of all real numbers that can be substituted for x such that the resulting value of the function is a real number. E.g. if we've to find the domain of the function f(x) = x + 3, you can see that there is no restriction on x as all values of x as long as it is a real number, lead to a real number for f(x). Hence, the domain of this function is the set of all real numbers. Also, the set of all correspondence values of f(x) is called range.

This FREE mini-lesson is a part of Winpossible's online course that covers all topics within Algebra I. Click on the video below to go through it. If you like it, you can buy our online course in Algebra I by clicking here.

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