Web Reference: For a complete lesson on evaluating functions and function notation, go to https://www.MathHelp.com - 1000+ online math lessons featuring a personal math teacher inside every lesson! Try a complete lesson on Evaluating and Graphing Functions, featuring video examples, interactive practice, self-tests, worksheets and more! To evaluate a function, substitute the input (the given number or expression) for the function's variable (place holder, x). Replace the x with the number or expression. 1. Given the function f (x) = 3 x - 5, find f (4). Solution: Substitute 4 into the function in place of x. f (4) = 3 (4) - 5 = 7.
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