This document provides an example of using the binomial theorem to expand expressions involving multiplication of binomials. It shows the step-by-step expansion of (x2 + 2xy + y2)(x + y) by first multiplying (x2 + 2xy + y2) by (x + y) and then multiplying the result by (x + y) again. The final expanded expression is x3 + 3x2y + 3xy2 + y3.