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Ex 3.4, 2 - Chapter 3 Class 12 Matrices (Term 1)
Last updated at May 29, 2018 by Teachoo
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 (MCQ)
Example 23
Ex 3.4, 1
Ex 3.4, 2 You are here
Ex 3.4, 3
Ex 3.4, 4
Ex 3.4, 5
Ex 3.4, 6
Ex 3.4, 7
Ex 3.4, 8 Important
Ex 3.4, 9
Ex 3.4, 10
Ex 3.4, 11
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
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
Transcript
Ex3.4, 2 Find the inverse of each of the matrices, if it exists.[ 8(2&1@1&1)] Let A = [ 8(2&1@1&1)] We know that A = IA [ 8(2&1@1&1)] = [ 8(1&0@0&1)] A R1 R1 R2 [ 8( &1 1@1&1)] = [ 8(1 0&0 1@0&1)] A [ 8( &0@1&1)] = [ 8(1& 1@0&1)] A R2 R2 R1 [ 8(1&0@ &1 0)] = [ 8(1& 1@0 1&1 ( 1))] A [ 8(1&0@ &1)] = [ 8(1& 1@ 1&2)] A I = [ 8(1& 1@ 1&2)] A This is similar to I = A-1A Thus, A-1 = [ 8(1& 1@ 1" " &2" " )]
