The expression "n((k-2)n - (k-4))" represents a mathematical formula involving variables n and k. Here, n is multiplied by the result of the expression inside the parentheses, which is a quadratic expression in terms of n. The term "(k-2)n" indicates that k influences the linear component of the equation, while "(k-4)" is a constant that shifts the value of the expression. This formula can be used in various mathematical contexts, such as algebra or calculus, to analyze relationships between variables. Understanding how to manipulate and simplify such expressions is essential for solving equations and modeling real-world scenarios in fields like physics and engineering.