Question

Which expression is not a polynomial? A. 3x + 5 B. 2/5x - 21 C. 5 D. x^-3 + 5x

Answer 1

Answer:

C. 5

Step-by-step explanation:

"Polynomial" means consisting of several terms, or more than one term.

In A, we see that there are 2 terms (3x and 5), and so it is a polynomial, specifically a binomial.

In B, we also see 2 terms (2/5x and -21), and so it is also a polynomial, specifically a binomial.

In C, we only see one term (5), and so it is a monomial, or having only one term.

In D, we can see 2 terms (x^-3 and 5x), and so it is also a polynomial, specifically a binomial.

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