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# MATRICES AND DETERMINANTS

CONTENT

1. Definition of Matrix
2. Order of Matrix
3. Notation of Matrix
4. Types of Matrix
5. Addition and Subtraction of Matrix
6. Scalar Multiplication of Matrices

## Definition of Matrix

A matrix (plural matrices) is a rectangular array of numbers, symbols, or expressions, arranged in rows and columns. For example, the dimensions of the matrix below are 2 × 3 (read “two by three”), because there are two rows and three columns:

$$\begin{bmatrix} 5 & 1 & 3\\ 2 & 4 & 4 \end{bmatrix}$$

The following below are also examples of matrices:

(a) $$\begin{Bmatrix} -1 & 3 & 10\end{Bmatrix}$$

(b) $$\begin{Bmatrix} 4 & 5 \\-6 & 0 \\-2 & 18\end{Bmatrix}$$

(c) $$\begin{Bmatrix} 9 & 10 & 7 \\ -3 & 8 & 5 \\ 13 & 0 & 1\end{Bmatrix}$$

(d) $$\begin{Bmatrix} 2 \\ -1 \\ 4\end{Bmatrix}$$

## The Order of Matrix

The matrices above can be named as explained in the example given in the definition.

Lesson tags: General Mathematics Lesson Notes, General Mathematics Objective Questions, SS3 General Mathematics, SS3 General Mathematics Evaluation Questions, SS3 General Mathematics Evaluation Questions First Term, SS3 General Mathematics First Term, SS3 General Mathematics Objective Questions, SS3 General Mathematics Objective Questions First Term
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