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Each term in an expression can be further broken up into coefficients and variables:

 The coefficient of a term is the numerical part, including the minus sign when the term is negative. It's usually listed before the variable, at the beginning of the term.

 The variable part of a term is everything except the coefficient, which includes all variables and their exponents.

Identifying the coefficient and variable parts of a term is useful when you want to simplify an expression by combining like terms (as I explain in Chapter 3).

Table 2-3 shows you how to break the expression into four terms, and then break each term further into coefficient and variable.

TABLE 2-3 The Expression and Its Coefficients and Variables

Expression	Coefficient	Variable
	-1
	-8
x	1	x
4	4	None (Constant term)