근의 공식, or the quadratic formula, is a mathematical formula used to find the roots of a quadratic equation, which is typically in the form ax^2 + bx + c = 0. The formula is expressed as x = (-b ± √(b² - 4ac)) / (2a), where a, b, and c are coefficients of the equation. The symbol "±" indicates that there can be two possible solutions for x. The term b² - 4ac is known as the discriminant. It helps determine the nature of the roots: if it is positive, there are two distinct real roots; if it is zero, there is one real root; and if it is negative, the roots are complex numbers. Understanding 근의 공식 is essential for solving various problems in algebra and calculus.