This math topic focuses on determining the domain of a function where the function is given as a fraction with a square root in the numerator and another square root in the denominator. The functions are structured such that the denominator might involve a quadratic expression, potentially with complex roots, requiring the student to assess conditions under which these square roots are defined. The problems presented are multiple-choice questions, each providing sets describing possible function domains for evaluation. This practice is aimed at developing skills to analyze conditions for function validity within the context of real numbers.