Domain and range
The domain of a function is every input (x-value) it accepts, and the range is every output (y-value) it produces. For y = x^2, the domain is all real numbers, but the range is only 0 and positive numbers, since squaring a number never gives a negative result. In a real situation the domain often narrows further, like only positive whole numbers of workers when a function counts hours needed to assemble a product.
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