Answer:
B: [tex] 2x^3 - 7y^3 [/tex].
Step-by-step explanation:
A binomial is an algebraic expression consisting of two terms. Let's analyze the given options:
A. [tex] ab [/tex] - This is a monomial (one term).
B. [tex] 2x^3 - 7y^3 [/tex] - This is a binomial (two terms).
C. [tex] x + 2y^2 - 7 [/tex] - This is a trinomial (three terms).
D. [tex] 5xy [/tex] - This is a monomial (one term).
Therefore, the binomial among the given options is option B: [tex] 2x^3 - 7y^3 [/tex].
