### Chapter 3 - Expressions

This chapter discusses algebraic expressions. It contains the following sections:
• section 3.1 - In this section we introduce expressions, define parts of expression, types of expressions and explain the distributive law.

• section 3.2 - We explain the addition and subtraction of expressions.

• section 3.3 - We give the basic properties of exponents. These properties are required in the following two sections on the multiplication and division of expressions.

• section 3.4 - We explain the multiplication of expressions. There are three cases, depending on whether the expressions are monomials or multinomials.

• section 3.5 - We explain the division of expressions. There are three cases, depending on whether the expressions are monomials or multinomials.

• section 3.6 - We present the binomial and multinomial theorems, which describe how to expand powers of binomials and multinomials.

• section 3.7 - We present a data structure called a tree which holds the structure of an expression.

• section 3.8 - This is a reference section that lists in one place all the simplifications that could possibly be applied to an expression.