Answer: perfect square trinomials
Explanation:
Although you don't provide the 4 multiple choice answers, here they are:
a) perfect square monomials
b) difference of terms
c) perfect square trinomials
d) difference of perfect squares
The answer is c) perfect square trinomials, for a perfect square trinomial is a trinomial that can be factored into a binomial multiplied to itself.
In the scenario of a perfect square trinomial, there will be 2 terms that'll be perfect squares. For example, in the trinomial x2 - 12x + 36, both x2 and 36 are perfect squares.
In this case, it is a special product formula because there's a specific formula for them — unlike the other answers.