Trinomial is a polynomial which has three terms. The three terms can be any variable. For instance 2x + 4y +9z and x^3 + 4x^2 + 5x are trinomials. Today in this session we are going to discuss about Factoring Trinomials. Trinomials are the very interesting and important part of the elementary algebra. 2. ax^2 + bx +c 1. x^2 + bx + c How To Factor Trinomials Know More About How do you Find the Circumference of a Circle So first of all we should know the whole procedure to solve these problems.