A student describes what similar triangles are and how to solve problems with their properties. Questions this video answers: How can I tell if two triangles are similar? What are some properties of similar triangles?
A student applies the Remainder Theorem: For a polynomial p(x) and a number a, the remainder on division by x - a is p(a), so p(a) = 0 if and only if (x - a) is a factor of p(x).