Class 8 Maths Algebraic Expressions and Identities Introduction

Introduction

An algebraic expression is an expression built up from integer constants, variables, and the algebraic operations like addition, subtraction, multiplication, division, etc.

Class_8_Alegbraic_Expressions_&_Identities_Figure1

A variable can take any value. Its value is not fixed.

Ex: x, y, z, p, q, …….., etc are variables.

A constant has a fixed value.

Ex: 10, -20, 100, etc. are constant.

Now, we combine variables and constants to make algebraic expressions.

Ex: 2x + 5, 7y – 10, etc are algebraic expressions.

An algebraic expression 2x + 5 is formed as:

First the variable x is multiplied to constant 2 and then adding the constant 5 to the product.

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