This math topic focuses on finding the domain of functions involving square roots of linear expressions. Students are required to determine the acceptable values of \(x\) where the function remains defined, specifically avoiding negative values under the square root. Each problem provides a function and asks what set describes its domain, requiring understanding of the conditions under which square roots produce real numbers. The problems include multiple-choice answers depicting different domain sets in mathematical notation. This allows learners to apply their knowledge of square root properties and inequalities to define function domains.