|Class 8 Maths Algebraic Expressions and Identities||Introduction|
An algebraic expression is an expression built up from integer constants, variables, and the algebraic operations like addition, subtraction, multiplication, division, etc.
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.