Math Tutoring on Determining Function Values
Now that we know a function is a special relation in which each input has exactly one output we often use special notation to communicate that a relation is a function. The notation is called function notation, for example, y = f(x). So f(x) is function notation where f(x) is the output resulting from applying the function rule f to the input x. So when using function notation we need to remember that x is the input and f(x) is the output and therefore f(x) = y. When we first see this notation though it is easy to think that this means f times x, but it does not. Its special notation called function notation.
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