Find<span> the </span>domain<span> of a square root function. </span>Find<span> the </span>domain and range<span> of a function from the algebraic form. Functions are a correspondence between two sets, called the </span>domain<span> and the </span>range<span>. When defining a function, you usually state what kind of numbers the </span>domain<span> (x) and </span>range<span> (f(x)) values can be.</span>