(7)
Given the equation;
[tex](y+9)(y-9)=y^2-81[/tex]
A binommial is a polynomial that is the sum of two terms, that is;
[tex]y^2-81\ldots.\ldots\ldots\ldots.\text{ is a binommial}[/tex]
Thus;
[tex](y+9)(y-9)=y^2-81[/tex]
is a binommial that is a product of sum and difference of two terms.
CORRECT OPTION: D
