NCERT Solutions for Class 12 Maths Chapter 4

Class XII Maths Chapter 4 solutions is given here. Download here the NCERT Solutions for class 12 Maths chapter 4 Determinants all exercises with miscellaneous exercise in Hindi Medium and English Medium in PDF for the new academic session 2021-2022. UP board solutions for class 12 Maths Chapter 4 are same as the NCERT Sols for 12th Maths Chapter 4. UP Board students are also using following NCERT Textbooks for new session, so class 12 UP Board students also can use these solutions for their help in problem solving. Other boards like MP Board, Uttarakhand, Gujrat Board, etc., are also following the textbooks based on NCERT.

The the solutions of questions are helpful for all the students who are using NCERT Books. To understand the 12th Maths Chapter 4 properly, we must know everything about matrices. So, first learn the concepts of the chapter 3 Matrices to do Chapter 4 Determinants.

NCERT Solutions for class 12 Maths chapter 4




Class: 12Maths (English and Hindi Medium)
Chapter 4:Determinants

12th Maths Chapter 4 Solutions

In this chapter we shall study determinants up to order three only with real entries. The history about determinant is given below to know more about this fact. Download NCERT solutions for class 12 Maths chapter 4 determinants all six exercise with miscellaneous in PDF format. UP Board Solutions for Class 12 Maths Chapter 4 is same as NCERT Sols for 12th Maths Chapter 4 Determinants. So, UP Board students can also take the benefits of these solutions.

Class 12 Maths Exercise 4.1 Videos Solutions

Class 12 Maths Chapter 4 Exercise 4.1 Solution
Class 12 Maths Exercise 4.1 Solution in Hindi




Class 12 Maths Exercise 4.2 Videos Solutions

Class 12 Maths Chapter 4 Exercise 4.2 Solution
Class 12 Maths Exercise 4.2 Solution in Hindi

Class 12 Maths Exercise 4.3 Videos Solutions

Class 12 Maths Chapter 4 Exercise 4.3 Solution
Class 12 Maths Exercise 4.3 Solution in Hindi

Class 12 Maths Exercise 4.4 Videos Solutions

Class 12 Maths Chapter 4 Exercise 4.4 Solution
Class 12 Maths Exercise 4.4 Solution in Hindi



Class 12 Maths Exercise 4.5 Videos Solutions

Class 12 Maths Chapter 4 Exercise 4.5 Solution
Class 12 Maths Exercise 4.5 Solution in Hindi

Class 12 Maths Exercise 4.6 Videos Solutions

Class 12 Maths Chapter 4 Exercise 4.6 Solution
Class 12 Maths Exercise 4.6 Solution in Hindi

Class 12 Maths Miscellaneous Exercise 4 Videos Solutions

Class 12 Maths Miscellaneous Exercise 4 Solution
Class 12 Maths Misc. Exercise 4 Solution in Hindi



Properties of Determinants

If all the rows of a determinant are converted into the corresponding columns, the value of the determinant remains same.

Matrices - Class 12 Maths Image 1

If two rows (columns) of a determinant are interchanged, the value of the new determinant is the additive inverse of the value of the given determinant.

Matrices - Class 12 Maths Image 2

The value of a determinant gets multiplied by k, if every entry in any of its row (column) is multiplied by k.

Matrices - Class 12 Maths Image 3

If some or all elements of a row or column of a determinant are expressed as sum of two (or more) terms, then the determinant can be express as sum of two (or more) determinants.

Matrices - Class 12 Maths Image 4

If the corresponding entries in any two rows ( or columns) are identical, the value of the determinant is zero.

Matrices - Class 12 Maths Image 5




The value of a determinant does not changes if any of its rows (columns) is multiplied by non-zero real number k and added to another row (column).

Matrices - Class 12 Maths Image 6
MINORS AND COFACTORS

Minor – Removing entries of the column and the row containing a given element of a determinant and keeping the surviving entries as they are, yields a determinant called the minor of the given element.
Cofactor – If we multiply the minor of an element by (-1)^(i+j), where i is the number of the row and j is the number of the column containing the element, then we get the cofactor of that element.

Historical Facts

1. The Chinese early developed the idea of subtracting columns and rows as in simplification of a determinant using rods. Seki Kowa, the greatest of the Japanese Mathematicians of seventeenth century in his work ‘Kai Fukudai no Ho’ in 1683 showed that he had the idea of determinants as well as their expansion.
2. T. Hayashi, “The Fakudoi and Determinants in Japanese Mathematics,” in the proc. of the Tokyo Math. Soc., V. Vendermonde was the first to recognise determinants as independent functions. He may be called the formal founder.
3. Laplace (1772), gave general method of expanding a determinant in terms of its complementary minors.
4. Lagrange, in 1773, treated determinants of the second and third orders and used them for purpose other than the solution of equations.
5. Gauss, in 1801, used determinants in his theory of numbers.
6. Jacques – Philippe – Marie Binet, in 1812, stated the theorem relating to the product of two matrices of m-columns and n-rows, which for the special case of m = n reduces to the multiplication theorem.
7. Cauchy, in 1812, presented one on the same subject. He used the word ‘determinant’ in its present sense. He gave the proof of multiplication theorem more satisfactory than Binet’s.
8. The greatest contributor to the theory was Carl Gustav Jacob Jacobi, after this the word determinant received its final acceptance.

In which practical fields can students use determinants chapter 4 of 12th Maths?

Determinants have wide applications in Engineering, Science, Economics, Social Science, etc. Determinants have wonderful algebraic properties and occupied their proud place in linear algebra because of their role in higher-level algebraic thinking.

Which main topics will students study in chapter 4 of class 12th Maths?

In chapter 4 of class 12th Maths, students will study determinants up to order three only with real entries. Also, students will study various properties of determinants, minors, cofactors and applications of determinants in finding the area of a triangle, adjoint and inverse of a square matrix, consistency and inconsistency of the system of linear equations and solution of linear equations in two or three variables using the inverse of a matrix.

Can students do chapter 4 Determinants of 12th Maths without going through chapter 3?

Students can’t do chapter 4 of class 12th Maths without doing chapter 3 of class 12th Maths. Before starting chapter 4, Determinants of class 12th Maths, students should first do chapter 3 Matrices of grade 12th Maths. Chapter 3 Matrices of class 12th Maths works as a base for chapter 4 Determinants of grade 12th Maths.

Does chapter 4 of grade 12th Maths has any miscellaneous exercise?

Chapter 4 of grade 12th Maths has a miscellaneous exercise. There are seven exercises in chapter 4 of class 12th Maths, and the last exercise is the miscellaneous exercise of chapter 4 of grade 12th Maths. In the first exercise, there are eight questions. The second exercise has 16 questions. The third exercise contains five questions. There are five questions in the fourth exercise. In the fifth exercise, there are 18 questions. The sixth exercise has 16 questions. There are 19 questions in the last (Miscellaneous) exercise.