Final answer:
The situation described in the question lacks the context or specific trinomials needed to provide a definitive answer, but it appears to inquire about adding or subtracting the constant terms in a trinomial after combining like terms.
Step-by-step explanation:
The question asks about combining the third monomial in each respective trinomial to find the result.
To solve this, let's examine the provided solutions. The quadratic equation ax² + bx + c = 0 is relevant to our problem, and the values for a, b, and c seem to be given in different contexts as a = 3, b = 13, and c = -10.
Using these values in the quadratic formula, −b ± √(b² - 4ac) / (2a), we would get two solutions for x, which are not directly related to combining monomials.
However, the given options suggest we are looking for a simplified form of a trinomial rather than solving a quadratic equation. Without additional context or specific trinomials provided, we cannot definitively determine the correct answer, but the question appears to be about finding a result after combining like terms. Typically, this would involve adding or subtracting coefficients of like terms, in this case, the constant terms.