Answer:
• Algebraic expression is formed from variables and constants using 
different operations. 
• Expressions are made up of terms. 
• A term is the product of factors. Factors may be numerical as well as 
algebraic (literal). 
• Coefficient is the numerical factor in a term. Sometimes, any factor 
in a term is called the coefficient of the remaining part of the term. 
• The terms having the same algebraic factors are called like terms. 
• The terms having different algebraic factors are called unlike terms. 
• Expression with one term is called a 'Monomial’. 
• Expression with two unlike terms is called a 'Binomial’. 
• Expression with three unlike terms is called a 'Trinomial’. 
• In general, an expression with one or more than one term (with non- 
negative integral exponents of the variables) is called a ‘Polynomial’. 
• The sum (or difference) of two like terms is a like term with coefficient 
equal to the sum (or difference) of coefficients of the two like terms.