Chapter 7 - Algebraic Expressions - R D Sharma Solutions for Class 7

Algebraic expression can be defined as the combination of constants and variables connected by algebraic operations such as addition, subtraction, multiplication and division. In this expression, parts which are connected by these algebraic operations are known as terms of the expression.

Types of algebraic Expressions:

1. Monomial: The expression which is having only one term is called a monomial. For example: 3x, -5abc etc.
2. Binomial: The expression which is having two terms is known as binomial. For example: y + 3, 6 – 8x etc.
3. Trinomial: The expression which is having three terms is known as trinomial. For example: 3x+5y-7 etc.
4. Quadrinomial: The expression which is having four terms is known as quadrinomial. For example: x+y+z-4 etc
5. Polynomial: The expression which is having two or more terms is known as polynomial.

Like terms: Those terms which are having the same factors are known as like terms.

Unlike terms: Those terms which are not having the same factors are known as unlike terms.

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Procedure to find out the value of an Algebraic Expression:

1) Write the algebraic expression

2) Obtaining the values of literals (variables) involved.

3) Replacing each literal by its numerical value.

4) Simplifying the expression so obtained.