Web Reference: Function notation tells us the "name" of the function, and the "algebraic rule" it will be using. Traditionally, functions are referred to by single letter names, such as f, g, h and so on. Dec 15, 2024 · While the notation and wording is different, the process of evaluating a function is the same as evaluating an equation: in both cases, you substitute 2 for x, multiply it by 4 and add 1, simplifying to get 9. How do you evaluate functions? The same way that you substitute values into equations! Example 1 What is the value of $$ x $$ given the equation $$ y = 2x $$ when $$ x = 5 $$? Substitute '5' in for x : The one new aspect of function notation is the emphasis on input and output .
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