Web Reference: 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. Dec 15, 2024 · Rather than using the variable y, the equations of functions can be written using function notation. Function notation is very useful when you are working with more than one function at a time, and substituting more than one variable in for x. When we know an input value and want to determine the corresponding output value for a function, we evaluate the function. Evaluating will always produce one result because each input value of a function corresponds to exactly one output value.
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