Question

Which shows the result of the operations with these matrices? If the matrix does not exist, select impossible.

4⁢[
2 1 9 12
] −2⁢[
−5 8 7 0
]

Multiple choice question.

A)
[
3 −7 2 12
]


B)
[
18 −12 22 48
]


C)
[
13 −4 29 48
]


D)
impossible

Answer 1

B) [ 18 −12 22 48 ]

Calculation: 4[2 1 9 12] = [8 4 36 48]; 2[−5 8 7 0] = [−10 16 14 0]; subtract: [8−(−10), 4−16, 36−14, 48−0] = [18, −12, 22, 48].