# Ex 3.4, 18 - Chapter 3 Class 12 Matrices

Last updated at May 29, 2018 by Teachoo

Last updated at May 29, 2018 by Teachoo

Transcript

Ex3.4, 18 Matrices A and B will be inverse of each other only if A. AB = BA B. AB = BA = O C. AB = O, BA = I D. AB = BA = I Given that A & B will be inverse of each other i.e. A-1 = B & B-1 = A From (1) & (2) AB = BA = I So, the correct answer is D

Inverse of matrix using elementary transformation

Elementary operations on a matrix

Inverse of a matrix

Finding inverse of a matrix using Elementary Operations

Ex 3.4, 18 You are here

Example 23

Ex 3.4, 1

Ex 3.4, 2

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Ex 3.4, 7

Ex 3.4, 8 Important

Ex 3.4, 9

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Ex 3.4, 13

Example 25 Important

Ex 3.4, 12

Ex 3.4, 14

Example 24 Important

Ex 3.4, 15 Important

Ex 3.4, 16 Important

Ex 3.4, 17 Important

Chapter 3 Class 12 Matrices

Concept wise

- Formation and order of matrix
- Types of matrices
- Equal matrices
- Addition/ subtraction of matrices
- Statement questions - Addition/Subtraction of matrices
- Multiplication of matrices
- Statement questions - Multiplication of matrices
- Solving Equation
- Finding unknown - Element
- Finding unknown - Matrice
- Transpose of a matrix
- Symmetric and skew symmetric matrices
- Proof using property of transpose
- Inverse of matrix using elementary transformation
- Proof using mathematical induction

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Davneet Singh

Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 9 years. He provides courses for Maths and Science at Teachoo.