Assuming the standard x and y axes, the range is the maximum value of y minus minimum value of y; and the domain is the maximum value of x minus minimum value of x.
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The range of a function is the set of all of the possible values that it can take on as an output value. You find the range by inspecting the function and seeing first what the domain is, and then what the range would be for that domain. The domain, then, is the set of all of the possible values that it can take on as an input value.
Domain is the set of all possible numbers for a function on the X axis on a graph, and range is the set of all possible numbers for a function along the Y axis on a grpah. (The X axis is the one that runs horizontally, while the Y axis runs vertically). The domain and range define from and up to which numbers a function's point (coordinate) may be located on a graph. To state the domain of a function, you must find out what values "x" may and may not be in the function (equation), and the same goes for range. A good way to check if you've got your domain and range right is to try plugging in the numbers that you have found to be "restricted" and see if they really do produce an impossible or inaccurate result, or doesn't give you a result at all!
Given the function g(f(x)) = 2-x, you can find the domain as you would with any other function (i.e. it doesn't matter if it's composite). The output, however, has to be a real number. With this function, the domain is all real numbers. If you graph it, you see that the function is defined across the entire graph, wherever you choose to plot it.
how don you find write the domain of a function
Find all possible "x" and "y" values for domain and range. Then put it in inequality form. For example the domain and range for the equation 2x-3/x-5 would be: Domain: All Reals; x>5 Range: All Reals