Free public beta until December 4, 2026: every course is open, no card needed. After that, the first chapter of each course stays free and full access is a one-time $39 ($19 for up to 100 founding members chosen for helpful feedback). Your progress is kept. How the beta works

trinomial

A polynomial with exactly three terms, like $x^2-4x+3$ .

A trinomial is a polynomial with exactly three terms, such as $x^2 - 4x + 3$ .