Answer:
[tex]y^{2} + 9y + 81[/tex]
Step-by-step explanation:
A perfect square trinomial is an algebraic expression that is of the form [tex]ax^2 + bx + c[/tex], which has three terms. It is obtained by the multiplication of a binomial with itself. For example, [tex]x^2 + 6y + 9[/tex] is a perfect square polynomial obtained by multiplying the binomial (x + 3) by itself.
