👉 A quadrinomial is a polynomial where all terms are of degree 4. In other words, it's a polynomial with exactly four terms. For example, the following are quadrinomials: 1. (x + y)² = x² + 2xy + y² 2. (x - y)² = x² - 2xy + y² A quadriennial is a polynomial where all terms are of degree 4 and have exactly four terms.
