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=(−245−6)
, find each of the following.
(a) 3A
(b) -2A
Solution:
(a)3A=3(−245−6)=(3×(−2)3×43×53×(−6))=(−61215−18)
(a) 3A
(b) -2A
Solution:
(b) −2A=−2(−245−6)=(−2×(−2)−2×4−2×5−2×(−6))=(4−8−1012)