For this case we have that by definition, a binomial is an algebraic expression that is formed by the sum (or difference) of two terms, also called monomials.
Examples:
[tex]ax + b\\xy ^ 2 + 3xz[/tex]
So, according to the previous definition we have that the binomial is:
[tex]9a ^ 2-5[/tex]
Answer:
Option B
