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A determinant is a number that can be determined for only square matrices. In solving a system of linear equations, a determinant checks whether the system of equations has a unique solution or not. It has many applications in engineering, science, social sciences, and economics, etc.
The NCERT Solutions for Class 12 of this chapter cover all the problems, such as finding the determinant of a 2×2 matrix, or 3×3 matrix, evaluating the area of the triangle, and finding the equation of the line using determinant, minors, and co-factors. They also cover problems involving calculating the determinant using minor and co-factor, adjoint, and the inverse of a matrix.
Students can now access the PDF of NCERT Solutions for Class 12 Maths Chapter 4 for free from the link given below.
Download PDF of NCERT Solutions for Class 12 Maths Chapter 4 Determinants
NCERT Solutions For Class 12 Maths Chapter 4 Determinants are available at ANAND CLASSES’S which are given by our expert faculty. The step-by-step solutions for all the questions enlisted under the chapter, which is included in the CBSE syllabus. Each solution has been explained using suitable examples or formulas. The NCERT Solutions for Class 12 Maths are written considering the marking scheme. ANAND CLASSES’S aims to bring out the very best in students through additional skill-building exercises that are tailored to their grade levels, abilities and interests.
Determinants chapter has a total of 6 exercises and a miscellaneous exercise that covers all the questions related to the chapter. Class 12 Chapter 4 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 ANAND CLASSES’S NCERT Solutions for Class 12. The topics discussed in Chapter 4 NCERT Solutions for Class 12 Maths include the following:
4.1 Introduction
Students have already read about how to represent a system of linear equations using matrices and the condition to know whether this system has a unique solution or not based on the determinant. These things will be revised under this section.
4.2 Determinant
4.2.1 Determinant of a matrix of order one
4.2.2 Determinant of a matrix of order two
4.2.3 Determinant of a matrix of order 3 × 3
In this section, students will learn how to find the determinant of a square matrix of different orders such as one, two and three, along with examples.
4.3 Properties of Determinants
In this section, students will study some properties of determinants which simplify their evaluation by obtaining the maximum number of zeros in a row or a column. These properties are correct for determinants of any order. However, in this chapter, it has been limited to determinants of order three only.
4.4 Area of a Triangle
We can find the area of a triangle using the formula when the coordinates of three vertices have been given. In this section, you will learn how to find the area of the triangle by converting the points into the form of a determinant.
4.5 Minors and Cofactors
Students will learn to write the expansion of a determinant in compact form using minors and cofactors after practising the problems in this section.
4.6 Adjoint and Inverse of a Matrix
4.6.1 Adjoint of a matrix
After solving the problems in this section, you will understand clearly how to find the inverse of a matrix using adjoint. Many theorems and examples are given in this section to enhance your skills.
4.7 Applications of Determinants and Matrices
4.7.1 Solution of a system of linear equations using the inverse of a matrix
Here, in these NCERT Solutions, Students will get a complete description of applications of determinants and matrices for solving the system of linear equations in two or three variables and how to check the consistency of the system of linear equations.
Exercise 4.1 Solutions: 8 Questions (2 Long, 5 Short Answers, 1 MCQ)
Exercise 4.2 Solutions: 16 Questions(7 Long, 7 Short, 2 MCQs)
Exercise 4.3 Solutions: 5 Questions ( 4 Short Answers, 1 MCQ)
Exercise 4.4 Solutions: 5 Questions (4 Long, 1 MCQ)
Exercise 4.5 Solutions: 18 Questions (11 Long, 5 Short, 2 MCQs)
Exercise 4.6 Solutions: 16 Questions (13 Long, 3 Short)
Miscellaneous Exercise Solutions: 19 Questions (15 Long, 1 Short, 3 MCQs)
The NCERT Solutions Class 12 of ANAND CLASSES’S for Chapter 4 cover the following points and formulas.
- If any two rows or any two columns are identical or proportional, then the value of the determinant is zero
- A square matrix A has an inverse if and only if A is non-singular
- The unique solution of equation AX = B is given by X = A–1 B, where A ≠ 0
- If a system of equations is consistent, then it has a solution
- If a system of equations is inconsistent, then there is no solution
- For a square matrix A in matrix equation AX = B:
If | A| ≠ 0, then there exists a unique solution
If | A| = 0 and (adj A) B ≠ 0, then there exists no solution
If | A| = 0 and (adj A) B = 0, then system may or may not be consistent
Q1
How many problems are there in NCERT Solutions for Class 12 Maths Chapter 4?
Exercise 4.1 of NCERT Solutions has 8 questions, Exercise 4.2 has 16 questions, Exercise 4.3 and 4.4 has 5 questions, Exercise 4.5 has 18 questions, Exercise 4.6 has 16 questions, and the miscellaneous exercise has 19 questions. Long answers, short answers and MCQs are present in each exercise covering the topics which are important from the exam point of view. The solutions for the exercise-wise problems are designed by a set of teachers at ANAND CLASSES’S having vast conceptual knowledge.
Q2
What are the uses of determinants according to NCERT Solutions for Class 12 Maths Chapter 4?
Determinants are one of the main concepts having a number of applications in algebra. This concept is useful for solving a set of linear equations. Using determinants, students will be able to understand the change in area, volume, variables in terms of integrals. It can also be used to calculate the values of square matrices.
Q3
Do NCERT Solutions for Class 12 Maths Chapter 4 help you to score well in the board exam?
Students should first solve the easier problems and then move on to the diificult problems 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. The main aim is to boost the confidence level of students and efficiency in solving complex problems within a shorter duration.
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