College Algebra / Alg 234 · Atom · ~20 seconds
Function Notation
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Function notation names the machine and its input at once: f(x) is the output of function f at input x.
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In f(x) = 2x + 3, the name is f, the input is x, and f(4) asks for the output at 4.
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f(x) is one symbol for an output, not f times x.
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