x2 + 12x + 36 is called a perfect square trinomial -- which is the square of a binomial. Example 2. ... 9x2 is the square of 3x. −24x is twice the product of 3x · −4. (3x · −4 = −12x.
perfect square binomial is a trinomial that when factored gives you the square of a binomial. For example, the trinomial x^2 + 2xy + y^2 is a perfect square binomial because it factors to (x + y)^2.
