**Function Notation | Lesson (article) | Khan Academy**
https://www.khanacademy.org/test-prep/sat/x0a8c2e5f:untitled-652/x0a8c2e5f:passport-to-advanced-math-lessons-by-skill/a/gtp--sat-math--article--function-notation--lesson

WebSee video transcript. A function takes an input and produces an output. In function notation, f ( x) , f is the name of the function, x is the input variable, and f ( x) is the output. For example, given f ( x) = 2 x + 1 , the expression 2 x + 1 works as instructions on what to do with the input x . In this case, the input x is multiplied by 2 ...

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