IntroFoundations
Function Notation
Overview
f(x) is the universal language of calculus. Understanding how to read, evaluate, and interpret function notation is the essential first step.
Key Concepts
1
f(x) means: apply rule f to input x and get output f(x)
2
f(3) = evaluate the function at x = 3
3
Domain: all valid inputs x; Range: all possible outputs f(x)
4
y = f(x) — y and f(x) are interchangeable notations
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