Function Notation | Lesson (article) | Khan Academy
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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