Which of the following algebraic expressions is a trinomial?

2x + 6 + 3x

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5y + 15xy + 6x

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9x + 2y - 6xy - 9x

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7y + 21z - 9x + 6xy

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Solution

The correct option is B 5y + 15xy + 6x
2x + 6 + 3x = 5x + 6, it contains two terms. Hence, it is a binomial.

In (5y + 15xy + 6x) contains three terms. Hence, it is a trinomial.

Simplifying (9x + 2y - 6xy - 9x), we get
(9x + 2y - 6xy - 9x) = (2y - 6xy) , which is a binomial.

7y + 21z - 9x + 6xy contains four terms. Hence, it is a 4-term polynomial.

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