Please tell me simply the given expresses lesson number 4 expressions using letter number class 7 NCERT you have a book on

Answer: An algebraic expression combines letters (variables) and numbers (constants) using arithmetic operations such as addition, subtraction, multiplication, and division (for example, $4x + 7$ ).

Step-by-step solution

Step 1: Understand Variables and Constants

A variable is an unknown value represented by letters such as $x$ , $y$ , or $l$ . A constant is a fixed numerical value such as $4$ or $100$ . Variables can take various numerical values, whereas constants have a fixed value.

Step 2: Combine using Arithmetic Operations

Algebraic expressions are formed by combining variables and constants using the basic mathematical operations of addition, subtraction, multiplication, and division. For example, multiplying the variable $x$ by $4$ and adding $7$ gives the expression $4x + 7$ .

Step 3: Identify Terms and Factors

Terms are added to form an expression. In the expression $4x + 7$ , the parts separated by addition are $4x$ and $7$ . Each term is formed as a product of its factors; for instance, $4x$ is the product of the numerical factor $4$ and the variable factor $x$ .

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