What is the domain of f(x) = x² + 2x + 1 ?
Domain is the set of x-values, or the "input" Range is the set of y-values, or the "output" ![]() As you'll notice in the graph, The domain {set of x-values} consists of all real numbers. The range {set of y-values} consists of all real numbers greater than or equal to 0.
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