Answer: 1. Identify Like Terms:The like terms in this expression are the terms containing m²n. These are -2m²n and 4m²n. The constant terms, 6 and -2, are also like terms.2. Combine Like Terms:Add the coefficients of the m²n terms: -2 + 4 = 2. Therefore, the m²n term simplifies to 2m²n.Add the constant terms: 6 + (-2) = 4.3. Simplified Expression:The simplified expression is 2m²n + 4Step-by-step explanation: