EXPLANATION
Given the polynomials in the problem, we can assevere that:
Formula of Perfect Square Trinomial:
(a+b)^2 = a^2 + 2ab + b^2
Difference of Squares formula:
(a^2 - b^2)
Now, we need to find what formula match better.
y^2 + 12y - 36 -----> Neither
