The expression 4a2b – 5ab2 + 1 is a: (1 mark)A) MonomialB) BinomialC) TrinomialD) None of these

To identify the nature of the expression $4a^2b - 5ab^2 + 1$, we need to determine how many terms it contains.

Step 1: Identify the Terms

1. The expression consists of three terms:
   • $4a^2b$
   • $-5ab^2$
   • $+1$

Step 2: Classify the Expression

2. Based on the number of terms:
   • A monomial has one term.
   • A binomial has two terms.
   • A trinomial has three terms.

Since there are three terms in the expression, it is classified as a trinomial.

Final Answer

The expression $4a^2b - 5ab^2 + 1$ is a C) Trinomial.