Functions

Numeric Substitutions Into Functions

Evaluate f(2) where f(x) is a given function. This is done by replacing every occurence of x in the formula defining the function with the given value and then doing the calculations.

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Algebraic Substitutions Into Functions

Evaluate f(s + t) where f(x) is a given function. This is done by replacing every occurence of x in the formula defining the function with the given expression and then doing the necessary algebra.

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Domains of Functions

The domain of a function is the set of all possible real values for which the function is defined. Functions are undefined, for example, where there would be division by zero or evaluation of a square (or more generally, even) root of a negative number.

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