A proof to show that the square root of two is an irrational number, followed by a shorter and even more beautiful proof.

This site from the Richland Community College contains information on long and synthetic division, the remainder theorem and the factor theorem.

This lesson provides basic instruction on the major concepts in algebra. Content includes a focus on fractions, units of conversion, complex numbers, quadratic equations, factorization and roots of polynomials, solving equations, systems...