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Class 9 Mathematics  Lecture 1 Exercise 1.1 (Complete Solved)

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Unit 1: (Matrices and Determinants)

             1.1  Introduction to Matrices

             1.2  Types of matrices

             1.3   Addition and subtraction of Matrices

             1.4  Multiplication of Matrix

             1.5  Multiplication of inverse of a Matrix

Ex: 1.1 Definitions

1.1  Matrix

  A rectangular array of real numbers enclosed within square brackets is called matrix. The real numbers are called the entries or elements of the matrix.

Let:

is a matrix of the order 3 x 3 because it consists of three rows and three columns.

  Equal matrices

         Two matrices A and B of is read as equal if

  (i)             Both A and B are of the same order.

  (ii)            Their corresponding entries are the same.

Q1: Find the order of the following matrices:

Q2:  Which of the following matrices are equal?

Q3: Find the values of a, b, c and d which satisfy the matrix equation. 

Their corresponding entries are same