# Addition and Subtraction of Algebraic Expressions

## Algebraic expressions are formed from variables and constants. We use the operations of addition and subtraction on the variables and constants to form expressions. The sum or difference of two like terms is a like term with coefficient equal to the sum or difference of the coefficients of two like terms. When we add two expressions, the like terms are added and unlike terms are left as they are. For solving an equation, we have to find the value of an expression. The value of the expression depends on the value of the variable from which the expression is formed. Algebra is a branch of mathematics in which letters are used to express the numbers, dimensions of a figure or many other things. An algebraic expression having two terms is called binomial. A number or a term having a fixed value is called a constant. Two monomials having same variables and same exponents are called like terms. An algebraic expression having one term is called monomial. An algebraic expression having three terms is called trinomial. An algebraic expression having more than three terms is called multinomial. Two monomials having different variables are called unlike terms. A number or a term which can have different values is called a variable.

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