Which of these is a binomial?

a. 5xy

b. x+2y^2-7

c. ab

d. 2x3-7y3

a. 5xy - monomial

b. x + 2y² - 7 → x, 2y², - 7 - trinomial

c. ab - monomial

d. 2x³ - 7y³ → 2x³, - 7y³ - binomial

d. 2x^3-7y^3

Step-by-step explanation:

Binomial is an expression that has only two terms

a. 5xy

5xy is a single term with two variables. so it is a monomial

b. x+2y^2-7

Here we have 3 terms x, 2y^2 and - 7. Expression with 3 terms is called as a trinomial

c. ab - it has only one term ab. so it is monomial

d. 2x^3-7y^3

It has two terms 2x^3 and - 7y^3. Expression with 2 terms is called as a binomial