NCERT Solutions for Class 8 Maths Chapter 9 Algebraic Expressions and Identities
The topic is introduced to study about the application of algebraic terms or application of variables in various kinds of scenarios. NCERT Solutions for Class 8 Maths Chapter 9 Algebraic Expressions and Identities will give you a detailed analysis and solution for every single question covered in the NCERT and also it makes your task easy while solving the problems.
Algebra is the most important branch of mathematics. In which we learn the application of variable and how equation forms and split using different kinds of techniques.In NCERT Class 8 Maths Chapter 9 Algebraic Expressions and Identities we will learn about finding coefficient of the variable in equation, product of the equation, division of the equation, subtraction of the equation and creating quadratic equation by the product of its two roots. Most of the students don't feel better while dealing with algebraic part of mathematics but if you go through some basics and practise lots of questions related to the concept then the algebra would become your one of the strongest parts in mathematics. It requires much attention then that of other mathematical sub topics.
9.1 What are Expressions?
9.2 Terms, Factors and Coefficients
9.3 Monomials, Binomials and Polynomials
9.4 Like and Unlike Terms
9.5 Addition and Subtraction of Algebraic Expressions
9.6 Multiplication of Algebraic Expressions: Introduction
9.7 Multiplying a Monomial by a Monomial
9.7.1 Multiplying two monomials
9.7.2 Multiplying three or more monomials
9.8 Multiplying a Monomial by a Polynomial
9.8.1 Multiplying a monomial by a binomial
9.8.2 Multiplying a monomial by a trinomial
9.9Multiplying a Polynomial by a Polynomial
9.9.1 Multiplying a binomial by a binomial
9.9.2 Multiplying a binomial by a trinomial
9.10 What is an Identity?
9.11 Standard Identities
9.12 Applying Identities
Few important identities explained in the NCERT class 8 chapter 9 Algebraic Expressions and identities are listed below.
we can write
This is simplified as follows
Now add each term
This is how we obtained the identity
Important identities explained in the NCERT class 8 chapter 9 Algebraic Expressions and identities
Try to find out how the above identities are formed by yourself.
Where we will use this identity? To understand these let's see an example
Example: What is the value of ?
Solution: Instead of multiplying it directly we will now use identity
this is of the form
we know that
here a=100, b =5 so,
This is how we will use identities to solve problems as mentioned above
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