When working with functions it’s important to understand function notation, or how the function is written. When writing a function there are two important aspects, the name of the function and the name of the independent variable. The name of the function is usually the letter *f,* but it can be any letter. See the following figure show how an example of function notation.

The above function is read *f *of *x, *with *f* being the name of the function and the *x* being the name of the independent variable.

Now it is possible to have more than one variable in a single function. To indicate that a single function has more than one variable in it, in the space inside the parenthesis you place all of the variables, separated by commas. For example, if a function, *h*, has four variables: *w, x, y, *and *z* would be written as:

To indicate that we are looking at a specific point in the function simply replace the variable inside the parentheses with the number we are looking at. This would be written as:

What this means is that you take the function, and replace all of the independent variables with the number 5.

Function Video

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