NCERT Solutions for Class 12 Maths Chapter 3 Matrices - #NCSOLVE 📚

 

Also Access

NCERT Exemplar for Class 12 Maths Chapter 3

CBSE Notes for Class 12 Maths Chapter 3

NCERT Solutions for Class 12 Maths Chapter 3 Matrices

Class 12 Chapter 3 NCERT Solutions covers the following topics and subtopics. Students can practise problems on these topics and get ready for the board exam with the help of BYJU’S NCERT Solutions for Class 12.
3.1 Introduction
In this chapter, students will be introduced to the fundamentals of matrix and matrix algebra. Here, students will learn how matrices are associated with different fields.
3.2 Matrix
3.2.1 Order of a matrix
This section explains clearly with an easy example, how the elements are arranged to form a matrix and how its order can be defined.
3.3 Types of matrices
3.3.1 Equality of matrices
We shall discuss different types of matrices in this section such as column matrix, row matrix, square matrix, diagonal matrix, scalar matrix, identity matrix and zero matrix. Besides, equality of matrices is also explained with examples.
3.4 Operations on Matrices
3.4.1 Addition of matrices
3.4.2 Multiplication of a matrix by a scalar
3.4.3 Properties of matrix addition
3.4.4 Properties of scalar multiplication of a matrix
3.4.5 Multiplication of matrices
3.4.6 Properties of multiplication of matrices
After this section, students will get an idea on certain operations on matrices, namely, the addition of matrices, multiplication of a matrix by a scalar, difference,  multiplication of matrices, and respective properties for each of these properties.
3.5 Transpose of a Matrix
3.5.1 Properties of transpose of the matrices
Transpose of a matrix and properties are explained clearly with examples. These examples prove the properties of the transpose of a matrix.
3.6 Symmetric and Skew Symmetric Matrices
In this section, students will learn the definitions of symmetric and skew symmetric matrices, along with the related theorems and examples.
3.7 Elementary Operation (Transformation) of a Matrix
After studying this section, students are able to understand transformations on a matrix. There are six operations, i.e., transformations on a matrix. Three of which are due to columns and three due to rows, which are known as elementary operations or transformations.
3.8 Invertible Matrices
3.8.1 Inverse of a Matrix by elementary operations

Here, students will learn about the necessary conditions for matrices to have the inverse of them. Also, it has been discussed how to get an inverse matrix by performing elementary operations on the elements of a matrix.
Exercise 3.1 Solutions: 10 Questions (7 Short Answers, 3 MCQs)
Exercise 3.2 Solutions: 22 Questions (14 Long, 6 Short, 2 MCQs)
Exercise 3.3 Solutions: 12 Questions (10 Short Answers, 2 MCQs)
Exercise 3.4 Solutions: 18 Questions (4 Long, 13 Short, 1 MCQ)
Miscellaneous Exercise Solutions: 15 Questions (7 Long, 5 Short, 3 MCQs)

The NCERT Solutions to questions provided by BYJU’S for Class 12 Maths Chapter 3 has covered all the below-mentioned properties and formulas.

• An ordered rectangular array of numbers or functions is called a matrix.
• A matrix which has m rows and n columns is called a matrix of order m × n.
• [aij]m×1 is a column matrix.
• [aij]1×n is a row matrix.
• An m × n matrix is a square matrix if m=n.
• A = [aij]m×m is a diagonal matrix if aij=0, when i≠j.
• A = [aij]n×n is a scalar matrix if aij=0, when i≠j, aij=k (k is some constant), when i=j.
• A = [aij]n×n is an identity matrix if aij=1, when i=j, aij=0, when i≠j.
• A zero matrix has all its elements as zero.
• A = [aij] = [bij] = B if (i)A and B of the same order, (ii) aij = bij for all possible values of i and j.
• kA = k[aij]m×n = [k(aij)m×n]
• -A = (-1) A
• A – B = A + (-1) B
• A + B = B + A
• (A + B) + C = A + (B + C),  where A, B and C are of the same order.
• k (A + B) = kA + kB, where A and B are of the same order, k is constant.
• (k + l) A = kA + lA, where k and l are constant.

Disclaimer – 

Dropped Topics – 3.7 Elementary Operations (Transformation) of a Matrix, 3.8.1 Inverse of Matrices by Elementary Operations (Retain Ques. 18 of Exercise 3.4), Page 98 Example 26, Page 100-101 Ques. 1–3 and 12 (Miscellaneous Exercise), Page 102 Third Last Point of Summary

Frequently Asked Questions on NCERT Solutions for Class 12 Maths Chapter 3

Q1

What are the main topics discussed in NCERT Solutions for Class 12 Maths Chapter 3?

In Mathematics, matrices are one of the easiest chapters, which, when understood, would be fun to solve. Matrix, types of matrices, operations on matrices, transpose of a matrix, symmetric and skew-symmetric matrices, elementary operation on matrix and invertible matrices are the main topics discussed in this chapter. These topics are explained in simple language to help students score well in the board exams, irrespective of their intelligence quotient.

Q2

Why should we learn about matrices in NCERT Solutions for Class 12 Maths Chapter 3?

Matrices are rectangular arrays of numbers which are represented in rows and columns. Various mathematical operations like multiplication, addition, subtraction and division can be performed using matrices. Representing the data related to infant mortality rate, population etc., are the widely used areas where matrices are used to simplify the calculation of complex data. The other substantial use of matrices are statistics, plotting graphs and various scientific research purposes. The method of solving difficult linear equations is also made simple using the matrices.

Q3

Do NCERT Solutions for Class 12 Maths Chapter 3 help you to score well in the board exam?

Students should first solve the easier problems and then move on to the problems of higher-level difficulty. After completing each exercise, students will be able to analyse the areas in which they are lagging behind. By practising the weaker concepts numerous times, students will be able to perform well in the board exams. Short-cut tips are also highlighted to help students understand the easier way of solving complex problems effortlessly.