what does f(x) mean khan academy

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On Khan Academy and in mathematics, “f(x)” represents a function where “x” is the input value, and “f” is the name of the function. It is used to express the relationship between the input and output values of the function.

Usage and Example

Here’s an example illustrating the use of “f(x)” on Khan Academy:

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    f(x) = 2x + 3
    Translation: The function "f" takes an input "x" and returns 2 times "x" plus 3.

In this example, “f(x)” defines a linear function.

Function Notation

“f(x)” is a common notation to describe various functions in mathematics and is used to communicate mathematical relationships.


“f(x)” on Khan Academy and in mathematics is a foundational notation for expressing functions and their input-output relationships, helping students understand mathematical concepts.

Educational Encyclopedia