# 4.4 Multiplication of a Matrix by a Number

4.4 Multiplication of a Matrix by a Number
When matrix is multiplied by a number, every element in the matrix is multiplied by the number.

Example:
Given that $A=\left(\begin{array}{cc}-2& 4\\ 5& -6\end{array}\right)$ , find each of the following.
(a) 3A
(b) -2A

Solution: