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# Math Homework Help

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You can also email us your homework directly at info homework1. Worried about timely completion of your mathematics homework? Algebra 1 Dressler Algebra 1 Saxon Geometry Carter, et al. Geometry Boyd, et al. Geometry - Concepts and Applications Cummins, et al.

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Intermediate Algebra Miller, et al. Intermediate Algebra Bittinger, et al. In other words, y is a function of x. Because of that, we sometimes see the function written in this form:. Since there's really no significance to y, and it's just an arbitrary letter that represents the output of the function, sometimes it will be written as f x to indicate the the expression is a function of x.

Note that you'll also see it written as g x , h x , and so forth, but f x is the most common because function starts with the letter f. To evaluate a function means to pick different values for the input often named x in order to find the output often named y. In terms of evaluation, for every choice of x that you pick, only one corresponding value of y will be the end result. You'll often be directed to evaluate a particular function for a certain value of x.

That means just plug in that value for x and see what you get, like below:. A function is a unique mapping from the domain the inputs to the range the outputs. There can only be one output for any input. A one-to-one function has a stricter definition than a regular function. Not only does each input map to one and only one output, but each output maps back to one and only one input. Independent variables are the inputs -- we can pick them, so they're independent of the function itself.

Dependent variables are the outputs -- they depend on the function and your selection of the inputs independent variables.