12-1    Factoring Integers Into Primes

12-2    Common Monomial Factoring

12-3    Factoring x²+ bx + c

12-4    Solving Some Quadratic Equations by Factoring

12-5    Factoring ax² + bx + c

12-7    Rational Numbers and Irrational Numbers

12-8    Which Quadratic Expressions are Factorable?