Question

A matrix equation is shown below.



[
−
2
3
1
0
]
+
[
a
b
c
d
]
=
[
−
2
3
1
0
]



Which of these is equivalent to
[
a
b
c
d
]
?




[
1
1
1
1
]


[
1
0
0
1
]


[
0
0
0
0
]


[
0
1
1
0
]

Answer 1

[0 0 0 0]

Because adding [a b c d] to [−2 3 1 0] leaves the same matrix, [a b c d] must be the zero matrix: [−2 3 1 0] + [0 0 0 0] = [−2 3 1 0].