RBSE Class 7 Maths Notes Chapter 12 Algebraic Expressions

These comprehensive RBSE Class 7 Maths Notes Chapter 12 Algebraic Expressions will give a brief overview of all the concepts.

RBSE Class 7 Maths Chapter 12 Notes Algebraic Expressions

→ Algebraic expression are formed from variables and constants. We use the operations of addition, subtraction, multiplication and division on the variables and constants to form expression.

→ Expression are made up of terms. Terms are added to make an expression.

→ A term is a product of factors.

→ Factors containing variables are said to be algebraic factors.

→ The coefficient is the numerical factor in the term. Sometimes anyone factor in a term is called the coefficient of the remaining part of the term.

→ Terms which have the same algebraic factors are like terms. Terms which have different algebraic factors are unlike factors.

→ Any expression with one or more terms is called a polynomial. Specifically a one term expression is called a monomial; a two term expression is called a binomial, and a three term expression is called a trinomial.

→ The sum (or difference) of two like terms is a like term with coefficient equal to the sum (or difference) of the coefficients of the two like terms.

→ When we add two algebraic expressions, the like terms are added as given above, the unlike terms are left as they are.

→ While solving an equation and using a formula, we have to find the value of an expression. The value of the expression depends on the value of the variable from which the expression is formed.

→ While finding the value of an expression proper sign should be used.

→ Rules and formulas in mathematics are written in a concise and general form using algebraic expressions : Thus the area of rectangle = lb, where l is the length and b is the breadth of the rectangle.

→ The general (nth) term of a number pattern (or a sequence) is an expression in n. Thus, the nth term of the number pattern 11, 21, 31, 41,.... is (10n + 1).