Expressions using Letter-Numbers

Letters used to represent numbers

Letters used to represent numbers, such as a, b, n, p, and y, are called letter-numbers. Aftab's age can be represented by a letter-number, and Shabna

Expressions containing letter

Expressions containing letter-numbers are called algebraic expressions. A relation such as Shabnam's age = Aftab's age + 3 becomes an algebraic expres

An algebraic expression takes a number

An algebraic expression takes a number value when the letter-number is replaced by a number. For example, if Aftab's age is 23, then Shabnam's age bec

Swapping and grouping terms does not

Swapping and grouping terms does not change the value of an expression. Brackets and a negative sign outside brackets must be handled carefully. The d

By convention

By convention, multiplication signs are omitted in algebraic expressions, and the number is written before the letter. So 4 times n is written as 4n.