A mathematical function (usually denoted as f (x)) can be thought of as a formula that will give you a value for y if you specify a value for x. The

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Inverse functions, in the most general sense, are functions that reverse each other. For example, here we see that function takes to , to , and to . The inverse of , denoted (and read as

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The inverse is usually shown by putting a little -1 after the function name, like this: f-1 (y) We say f inverse of y So, the inverse of f(x) = 2x+3 is written: f-1 (y) = (y-3)/2 (I also used y instead of x to show that we are using a different value.)