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**Introduction**

**Constant A symbol having a fixed numerical value is called a constant.**

**variable A symbol which takes various numerical values is called a variable.**

**Algebraic expressions A combination of constants and variables connected by the signs of fundamental operations of addition subtraction multiplication and division is called an algebraic expression.**

**Terms Various parts of an algebraic expression which are separated by the signs of + or - are called the terms of the expression.**

**Monomial An algebraic expression containing only one term is called a monomial.**

**Binomial An algebraic expression containing two terms is called a binomial.**

**Trinomial An algebraic expression containing three terms is called a trinomial.**

**Factors**

**Coefficient In a term of an algebraic expression any of the factors with the sign of the term is called the coefficient of the product of the other factors.**