These are solved class 9 math Ex 1.4 notes applicable for Class 9/ 9^{th}/ SSC-1/ Matric Part-I/ 9th Grade/ SSC Part-I/ High School/ O-Level/ General Science Group/ Humanities Group. Pdf of solved math chapter 1 (Matrices and Determinants) are provided. The Pdf’s contains notes of exercise 1.4.

## Class 9 Math Ex 1.4 Notes

## Download Class 9 Math Ex 1.4 Solution Notes Pdf

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## Chapter 1 **Exercise 1.4 Solution Notes PDF**

This is the Pdf notes of Solved class 9 math exercise 1.4 . It is same for Class 9/ 9^{th}/ SSC-1/ Matric Part-I/ 9th Grade/ SSC Part-I/ High School/ O-Level/ General Science Group/ Humanities Group Math book. The Notes are valid and are included in the syllabus and curriculum of FBISE(**Federal Board of Intermediate &Secondary Education**), Punjab Boards.

In class 9 math ex 1.4 notes of Matrices and determinants the process of Matrix Multiplication is briefly described for the multiplication of the matrices.

## Multiplication of Matrices

Two matrices A and Bare conformable for multiplication, giving product AB if

the number of columns of A is equal to the number of rows of B. So A and B matrices are conformable for multiplication.

### Associative Law under Multiplication

If A, B and C are three matrices conformable for multiplication then associative

law under multiplication is given as.

(AB)C = A(BC)

### Commutative Law of Multiplication of Matrices

Commutative law under multiplication in matrices does not hold in general i.e.,

if A and B are two matrices, then AB ≠ BA.

### Multiplicative Identity of a Matrix

Let A be a matrix. Another matrix B is called the identity matrix of A under multiplication if

AB=A=BA

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