请帮我解出这道题---14. 已知代数式 (x² + 2mx - 1)(xⁿ + 3nx + 2) 化简以后是一个四次多项式, 并且不含二次项, 请分别求出 m, n 的值, 并求出一次项系数. **Extraction Content:** * **Question Number:** 14. * **Question Stem:** Given the algebraic expression (x² + 2mx - 1)(xⁿ + 3nx + 2). After simplifying, it is a quartic polynomial, and it does not contain a quadratic term. Please respectively find the values of m and n, and find the coefficient of the linear term. * **Algebraic Expression:** (x² + 2mx - 1)(xⁿ + 3nx + 2) * **Conditions:** * The simplified expression is a quartic polynomial (degree 4). * The simplified expression does not contain a quadratic term (coefficient of x² is 0). * **Requirements:** * Find the value of m. * Find the value of n. * Find the coefficient of the linear term (coefficient of x).