Writing a function equation

how to graph a function

We then add 1 onto this, but again, this will yield a single value. So, when there is something other than the variable inside the parenthesis we are really asking what the value of the function is for that particular quantity.

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However, evaluation works in exactly the same way. In other words, we just need to make sure that the variables match up.

how to find the equation of a function from a graph

Recall the mathematical definition of absolute value. Circles are never functions. If you keep that in mind you may find that dealing with function notation becomes a little easier. From the equation, you can determine the missing variable. Be careful. Here are the evaluations. Recall, that from the previous section this is the equation of a circle.

In other words, we only plug in real numbers and we only want real numbers back out as answers.

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How to Write an Equation for a Function