Question

B = [[4], [3], [- 2]]; 3B = 121.A

Answer 1

To find the value of 3B, we need to multiply each element of the matrix B by 3.
Given B = [[4], [3], [-2]], when we multiply each element by 3, we get:
3B = [[34], [33], [3*-2]]
3B = [[12], [9], [-6]]
Therefore, 3B = [[12], [9], [-6]].