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### Assignment 1

Chapter 4: MatricesLesson 1: using Matrices to Represent Data

- Objectives:
- Represent mathematical and real-world data in a matrix.
- Find sums and differences of matrices and the scalar product of a number and a matrix.

MATRIX: A rectangular arrangement of numbers in rows and columns.

The ORDER of a matrix is the number of the rows and columns.

The ENTRIES are the numbers in the matrix.

What is a Matrix?

This order of this matrix is a 2 x 3.

columns

rows

(or square matrix)

3 x 3

(Also called a column matrix)

1 x 4

3 x 5

(or square matrix)

2 x 2

4 x 1

(Also called a row matrix)

- To add two matrices, they must have the same order. To add, you simply add corresponding entries.

To subtract two matrices, they must have the same order. You simply subtract corresponding entries.

Multiplying a Matrix by a Scalar

- In matrix algebra, a real number is often called a SCALAR. To multiply a matrix by a scalar, you multiply each entry in the matrix by that scalar.

Ch.4.1 pg.221 # 6 to 9, 12 to 14, and 19 to 23.

Due date: Sept. 30th, 2009

To: Mr. Mohammed Akour

By email: [email protected]

This presentation edited by Mr. Mohammed Akour

Mr Wassim Fakih

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