| binomial | a sum of two monomials, such as 3x2 + 7 |
| perfect square | any of the squares of the integers. Since 12 = 1, 22 = 4, 32 = 9, etc., 1, 4, and 9 are perfect squares |
| perfect square trinomial | a trinomial that is the product of a binomial times itself, such as r2 + 2rs + s2 (from (r + s)2), and r2 – 2rs + s2 (from (r – s)2) |
| trinomial | a three-term polynomial |