Question

Given the matrices A and B shown below, find & B + 3A.
A = [-1 -3] B = [4 22]

Answer 1

(1/2)B + 3A = [-1 2]

Explanation:

First start by multiplying B by 1/2:

(1/2)B = [4/2 22/2]

(1/2)B = [2 11]

Next, multiply A by 3:

3*A = [-1*3 -3*3]

3A = [-3 -9]

Then add the two matrices together:

(1/2)B + 3A = [2 11] + [-3 -9]

(1/2)B + 3A = [(2 + -3) (11 + - 9)]

(1/2)B + 3A = [-1 2]