Which of the following expressions is a trinomial?

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7a − 2a + 3b

4a² + 3b²

4a² + 2b − 7b

2a² + 6b² − 5a

answer is C.

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Detailed Solution

Let us check each option one by one.

Option A: 7a − 2a + 3b = 5a + 3b

Since the given expression contains two terms, it is a binomial.

Option B: 4a² + 2b − 7b = 4a² − 5b

Since the given expression contains two terms, it is a binomial.

Option C: 2a² + 6b² − 5a

Since the given expression contains three terms, it is a trinomial.

Option D: 4a² + 3b²

Since the given expression contains two terms, it is a binomial.

Hence, the expression 2a² + 6b² − 5a is the correct alternative.

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