EduSahara™ Assignment
Name : Matrix Addition and Subtraction
Chapter : Matrices
Grade : ICSE Grade X
License : Non Commercial Use
Question
1
1.
If A =
[
-4
1
-7
-6
]
and B =
[
-2
9
-4
-4
]
, then A
+
B =
(i)
[
-9
10
-11
-10
]
(ii)
[
-6
10
-12
-10
]
(iii)
[
-6
10
-11
-10
]
(iv)
[
-6
12
-11
-10
]
(v)
[
-6
10
-10
-10
]
Question
2
2.
If A =
[
0
-5
0
-9
]
and B =
[
-3
-7
-4
2
]
, then A
−
B =
(i)
[
3
2
6
-11
]
(ii)
[
1
2
4
-11
]
(iii)
[
3
3
4
-11
]
(iv)
[
3
2
4
-12
]
(v)
[
3
2
4
-11
]
Question
3
3.
If A =
[
0
-1
0
2
-2
3
1
-1
2
]
and B =
[
-1
-3
-2
-3
1
2
-3
-3
2
]
, then A
+
B =
(i)
[
-1
-4
-2
-1
-1
5
-2
-4
4
]
(ii)
[
-1
-6
-2
-1
-1
5
-2
-4
4
]
(iii)
[
-1
-4
-2
-1
-1
5
-2
-3
4
]
(iv)
[
-1
-4
-3
-1
-1
5
-2
-4
4
]
(v)
[
-1
-4
-2
-1
-1
8
-2
-4
4
]
Question
4
4.
If A =
[
2
0
1
]
and B =
[
-1
0
0
]
, then A
−
B =
(i)
[
3
0
1
]
(ii)
[
2
0
1
]
(iii)
[
3
1
1
]
(iv)
[
3
0
-2
]
(v)
[
6
0
1
]
Question
5
5.
If A =
[
1
0
0
-1
-2
0
]
and B =
[
-2
1
0
2
-2
-2
]
, then A
+
B =
(i)
[
-1
0
0
1
-4
-2
]
(ii)
[
-1
1
0
1
-4
-2
]
(iii)
[
-1
1
0
3
-4
-2
]
(iv)
[
-1
1
0
-1
-4
-2
]
(v)
[
-1
1
0
1
-3
-2
]
Question
6
6.
If A =
[
1
]
and B =
[
1
]
, then A
+
B =
(i)
[
4
]
(ii)
[
-1
]
(iii)
[
3
]
(iv)
[
1
]
(v)
[
2
]
Question
7
7.
If A =
[
4
1
-4
-4
0
-1
-4
-3
2
]
, then
10
A =
(i)
[
40
10
-40
-40
0
-10
-40
-27
20
]
(ii)
[
40
10
-40
-40
0
-10
-40
-30
20
]
(iii)
[
40
10
-40
-39
0
-10
-40
-30
20
]
(iv)
[
40
10
-40
-40
-2
-10
-40
-30
20
]
(v)
[
40
10
-40
-40
0
-10
-41
-30
20
]
Question
8
8.
If A =
[
-1
2
1
-3
]
and B =
[
-3
0
2
4
]
, then
7
A
+
7
B =
(i)
[
-28
12
21
7
]
(ii)
[
-28
14
21
7
]
(iii)
[
-28
14
21
8
]
(iv)
[
-28
13
21
7
]
(v)
[
-28
16
21
7
]
Question
9
9.
If A =
[
0
-5
0
-3
]
and B =
[
5
4
-5
-3
]
, then
8
A
−
9
B =
(i)
[
-45
-77
45
3
]
(ii)
[
-45
-76
45
3
]
(iii)
[
-45
-76
42
3
]
(iv)
[
-45
-73
45
3
]
(v)
[
-45
-76
45
4
]
Question
10
10.
If A =
[
6
-6
2
-2
-2
-4
1
4
1
]
and O =
[
0
0
0
0
0
0
0
0
0
]
, then A
+
O =
(i)
[
6
-6
2
-2
-2
-4
4
4
1
]
(ii)
[
6
-6
2
-2
-2
-4
-2
4
1
]
(iii)
[
6
-6
2
-2
-2
-4
1
4
1
]
(iv)
[
6
-6
2
-2
-2
-4
0
4
1
]
(v)
[
6
-6
2
-2
-1
-4
1
4
1
]
Question
11
11.
If A =
[
7
9
-8
8
]
, B =
[
2
-1
-2
0
]
and C =
[
3
-1
-3
-5
]
,
then
10
A
−
10
B
+
6
C
=
(i)
[
68
94
-78
49
]
(ii)
[
68
94
-78
53
]
(iii)
[
68
94
-78
50
]
(iv)
[
68
91
-78
50
]
(v)
[
68
94
-77
50
]
Question
12
12.
Find A , given that A
+
5
[
-4
-5
-1
3
]
=
[
-23
-21
4
7
]
(i)
[
-3
4
9
-8
]
(ii)
[
-3
4
10
-8
]
(iii)
[
-3
4
11
-8
]
(iv)
[
-3
4
9
-9
]
(v)
[
-3
1
9
-8
]
Question
13
13.
If A =
[
-2
1
-2
6
]
, then find B satisfying A
+ B = O
(i)
[
2
-1
2
-7
]
(ii)
[
2
-1
2
-6
]
(iii)
[
2
2
2
-6
]
(iv)
[
2
-1
2
-5
]
(v)
[
2
-1
2
-9
]
Question
14
14.
If A =
[
-2
1
0
4
]
, then find B satisfying A
+
B = I
(i)
[
3
-1
3
-3
]
(ii)
[
3
-1
0
-2
]
(iii)
[
3
-1
0
-4
]
(iv)
[
3
-1
0
-3
]
(v)
[
3
-1
0
-5
]
Question
15
15.
If A =
[
-9
5
9
-3
]
, then find B satisfying A
+ B = A
(i)
[
0
0
1
0
]
(ii)
[
-1
0
0
0
]
(iii)
[
0
0
2
0
]
(iv)
[
0
0
0
-2
]
(v)
[
0
0
0
0
]
Question
16
16.
If
(
A
+
B
)
= 0, then
a)
B is the additive inverse of A
b)
A is the additive identity of B
c)
B is the additive identity of A
d)
A is the additive inverse of B
(i)
{a,d}
(ii)
{c,d}
(iii)
{b,a}
(iv)
{b,d,a}
(v)
{b,c,a}
Question
17
17.
If A =
[
-5
9
-1
2
]
and B =
[
3
-6
-5
2
]
and D =
[
-16
100
20
8
]
,
4
A
−
8
B
+
4
C
= D, then C = ?
(i)
[
7
3
-4
4
]
(ii)
[
8
4
-4
4
]
(iii)
[
5
4
-4
4
]
(iv)
[
9
4
-4
4
]
(v)
[
7
4
-4
4
]
Question
18
18.
If A =
[
5
-7
-3
3
]
and the sum of the values of
elements of matrix kA =
-8
, find k
(i)
4
(ii)
5
(iii)
3
(iv)
1
(v)
6
Question
19
19.
If A =
[
-8
8
-1
0
]
, the value of -A =
(i)
[
8
-6
1
0
]
(ii)
[
8
-8
2
0
]
(iii)
[
8
-8
1
-1
]
(iv)
[
8
-8
-1
0
]
(v)
[
8
-8
1
0
]
Question
20
20.
If A =
[
-9
9
-6
-5
]
, B =
[
3
9
-2
5
]
and C =
[
-9
-2
-4
-8
]
,
then A
+
8
B
+
10
C =
(i)
[
-75
61
-63
-45
]
(ii)
[
-75
61
-62
-45
]
(iii)
[
-75
63
-62
-45
]
(iv)
[
-75
62
-62
-45
]
(v)
[
-78
61
-62
-45
]
Question
21
21.
Find the
additive
identity of matrix A =
[
-6
6
-7
-3
]
(i)
[
0
0
0
1
]
(ii)
[
0
0
0
0
]
(iii)
[
0
2
0
0
]
(iv)
[
-2
0
0
0
]
(v)
[
-1
0
0
0
]
Question
22
22.
Find the
additive
identity of matrix A =
[
-1
1
2
2
2
3
2
-2
1
]
(i)
[
0
0
0
0
0
1
0
0
0
]
(ii)
[
0
0
0
0
0
0
0
0
0
]
(iii)
[
0
0
0
0
0
-3
0
0
0
]
(iv)
[
0
0
-1
0
0
0
0
0
0
]
(v)
[
0
0
0
0
2
0
0
0
0
]
Assignment Key
1) (iii)
2) (v)
3) (i)
4) (i)
5) (ii)
6) (v)
7) (ii)
8) (ii)
9) (ii)
10) (iii)
11) (iii)
12) (i)
13) (ii)
14) (iv)
15) (v)
16) (i)
17) (v)
18) (i)
19) (v)
20) (ii)
21) (ii)
22) (ii)
