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Byju's Answer
Standard XII
Mathematics
Addition and Subtraction of a Matrix
Given the mat...
Question
Given the matrices
A
=
⎡
⎢
⎣
2
1
1
3
−
1
0
0
2
4
⎤
⎥
⎦
,
B
=
⎡
⎢
⎣
9
7
−
1
3
5
4
2
1
6
⎤
⎥
⎦
and
C
=
⎡
⎢
⎣
2
−
4
3
1
−
1
0
9
4
5
⎤
⎥
⎦
Verify that
(
A
+
B
)
+
C
=
A
+
(
B
+
C
)
.
Open in App
Solution
(
A
+
B
)
+
C
=
⎛
⎜
⎝
⎡
⎢
⎣
2
1
1
3
−
1
0
0
2
4
⎤
⎥
⎦
+
⎡
⎢
⎣
9
7
−
1
3
5
4
2
1
6
⎤
⎥
⎦
⎞
⎟
⎠
+
⎡
⎢
⎣
2
−
4
3
1
−
1
0
9
4
5
⎤
⎥
⎦
=
⎡
⎢
⎣
11
8
0
6
4
4
2
3
10
⎤
⎥
⎦
+
⎡
⎢
⎣
2
−
4
3
1
−
1
0
9
4
5
⎤
⎥
⎦
=
⎡
⎢
⎣
13
4
3
7
3
4
11
7
15
⎤
⎥
⎦
R
H
S
=
A
+
(
B
+
C
)
=
⎡
⎢
⎣
2
1
1
3
−
1
0
2
2
4
⎤
⎥
⎦
+
⎛
⎜
⎝
⎡
⎢
⎣
9
7
−
1
3
5
4
2
1
6
⎤
⎥
⎦
+
⎡
⎢
⎣
2
−
4
3
1
−
1
0
9
4
5
⎤
⎥
⎦
⎞
⎟
⎠
=
⎡
⎢
⎣
2
1
1
3
−
1
0
0
2
4
⎤
⎥
⎦
+
⎡
⎢
⎣
11
3
2
4
4
4
11
5
11
⎤
⎥
⎦
=
⎡
⎢
⎣
13
4
3
7
3
4
11
7
15
⎤
⎥
⎦
Hence
(
A
+
B
)
+
C
=
A
+
(
B
+
C
)
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0
Similar questions
Q.
Given the matrices
A =
2
1
1
3
-
1
0
0
2
4
, B =
9
7
-
1
3
5
4
2
1
6
and C =
2
-
4
3
1
-
1
0
9
4
5
Verify that (A + B) + C = A + (B + C).
Q.
Given A
=
{
1
,
2
,
3
,
4
}
, B
=
{
3
,
4
,
5
,
6
}
and C
=
{
6
,
7
}
. Verify that (A
∩
B)
∩
C = A
∩
(B
∩
C).
Q.
For the following matrices verify the associativity of matrix multiplication i.e. (AB) C = A (BC):
(i)
A
=
1
2
0
-
1
0
1
,
B
=
1
0
-
1
2
0
3
and
C
=
1
-
1
(ii)
A
=
4
2
3
1
1
2
3
0
1
,
B
=
1
-
1
1
0
1
2
2
-
1
1
and
C
=
1
2
-
1
3
0
1
0
0
1
.
Q.
Verify that
a
÷
(
b
+
c
)
≠
(
a
÷
b
)
+
(
a
÷
c
)
for each of the following values of a, b and c.
a = 12, b = - 4, c = 2
Q.
A
=
{
5
,
7
,
9
,
11
,
13
,
15
)
and
B
=
{
7
,
8
,
11
,
15
,
20
}
and
C
=
{
5
,
8
,
9
,
11
,
13
,
15
,
17
,
20
}
verify that :
A
∩
(
B
∩
C
)
=
(
A
∩
B
)
∩
C
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