ICSE Class 10 Maths Selina Solutions Chapter 9: ICSE Class 10 Maths Selina Solutions Chapter 9 Matrices provide a detailed guide to understanding the fundamental concepts of matrices. This chapter covers various topics such as types of matrices, matrix operations, and applications of matrices.
The solutions provided are detailed and easy to follow, ensuring that students can grasp complex concepts with ease. By studying these solutions, students can build a strong foundation in matrices which is important for higher-level mathematics.ICSE Class 10 Maths Selina Solutions Chapter 9 Matrices PDF
1. State, whether the following statements are true or false. If false, give a reason.
(i) If A and B are two matrices of orders 3 x 2 and 2 x 3 respectively; then their sum A + B is possible.
(ii) The matrices A 2 x 3 and B 2 x 3 are conformable for subtraction.
(iii) Transpose of a 2 x 1 matrix is a 2 x 1 matrix.
(iv) Transpose of a square matrix is a square matrix.
(v) A column matrix has many columns and one row.
Solution:
(i) False. The sum of matrices A + B is possible only when the order of both the matrices A and B are same. (ii) True (iii) False Transpose of a 2 x 1 matrix is a 1 x 2 matrix. (iv) True (v) False A column matrix has only one column and many rows.
2. Given:
, find x, y and z.
Solution:
If two matrices are said to be equal, then their corresponding elements are also equal. Therefore, x = 3, y + 2 = 1 so, y = -1 z – 1 = 2 so, z = 33. Solve for a, b and c if
(i)
(ii)
Solution:
If two matrices are said to be equal, then their corresponding elements are also equal. Then, (i) a + 5 = 2 ⇒ a = -3 -4 = b + 4 ⇒ b = -8 2 = c – 1 ⇒ c = 3 (ii) a = 3 a – b = -1 ⇒ b = a + 1 = 4 b + c = 2 ⇒ c = 2 – b = 2 – 4 = -24. If A = [8 -3] and B = [4 -5]; find:
(i) A + B (ii) B – A
Solution:
(i) A + B = [8 -3] + [4 -5] = [8+4 -3-5] = [12 -8] (ii) B – A = [4 -5] – [8 -3] = [4-8 -5-(-3)] = [-4 -2]
5. If A=
, B =
and C =
; find:
(i) B + C (ii) A – C
(iii) A + B – C (iv) A – B +C
Solution :
(i)B + C =1. Evaluate:
(i) 3[5 -2]
Solution:
3[5 -2] = [3×5 3x-2] = [15 -6]
(ii)
Solution:
(iii)
Solution:
(iv)
Solution:
2. Find x and y if:
(i) 3[4 x] + 2[y -3] = [10 0]
Solution:
Taking the L.H.S, we have 3[4 x] + 2[y -3] = [12 3x] + [2y -6] = [(12 + 2y) (3x – 6)] Now, equating with R.H.S we get [(12 + 2y) (3x – 6)] = [10 0] 12 + 2y = 10 and 3x – 6 = 0 2y = -2 and 3x = 6 y = -1 and x = 2
(ii)
Solution:
We have,3.
(i) 2A – 3B + C (ii) A + 2C – B
Solution:
(i) 2A – 3B + C
4.
Solution:
Given,
5.
(i) find the matrix 2A + B.
(ii) find a matrix C such that:
Solution:
(i) 2A + B1. Evaluate: if possible:
If not possible, give reason.
Solution:
2. If
and I is a unit matrix of order 2×2, find:
(i) AB (ii) BA (iii) AI
(iv) IB (v) A 2 (iv) B 2 A
Solution:
(i) AB
3. If
find x and y when x and y when A
2
= B.
Solution:
A 24. Find x and y, if:
Solution:
(i)
5.
(i) (AB) C (ii) A (BC)
Solution:
(i) (AB)
6.
is the following possible:
(i) AB (ii) BA (iii) A 2
Solution:
(i) AB
7.
Find A
2
+ AC – 5B.
Solution:
A 2
8. If
and I is a unit matrix of the same order as that of M; show that:
M 2 = 2M + 3I
Solution:
M 2
9.
and BA = M
2
, find the values of a and b.
Solution:
BA
10.
(i) A – B (ii) A 2 (iii) AB (iv) A 2 – AB + 2B
Solution:
(i) A – B
11.
(i) (A + B) 2 (ii) A 2 + B 2
(iii) Is (A + B) 2 = A 2 + B 2 ?
Solution:
(i) (A + B)
12. Find the matrix A, if B =
and B
2
= B + ½A.
Solution:
B 2
13. If
and A
2
= I, find a and b.
Solution:
14. If
then show that:
(i) A(B + C) = AB + AC
(ii) (B – A)C = BC – AC.
Solution:
(i) A(B + C)
15. If
simplify: A
2
+ BC.
Solution:
A 2 + BC1. Find x and y, if:
Solution:
2. Find x and y, if:
Solution:
3. If;
; find x and y, if:
(i) x, y ∈ W (whole numbers)
(ii) x, y ∈ Z (integers)
Solution:
From the question, we have x 2 + y 2 = 25 and -2x 2 + y 2 = -2 (i) x, y ∈ W (whole numbers) It can be observed that the above two equations are satisfied when x = 3 and y = 4. (ii) x, y ∈ Z (integers) It can be observed that the above two equations are satisfied when x = ± 3 and y = ± 4.
4.
(i) The order of the matrix X.
(ii) The matrix X.
Solution:
(i) Let the order of the matrix be a x b. Then, we know that5. Evaluate:
Solution:
6.
3A x M = 2B; find matrix M.
Solution:
Given, 3A x M = 2B And let the order of the matric of M be (a x b)
7.
find the values of a, b and c.
Solution:
8.
(i) A (BA) (ii) (AB) B.
Solution:
(i) A (BA)
9. Find x and y, if:
Solution:
10. If matrix
find the matrix ‘X’ and matrix ‘Y’.
Solution:
11. Given
find the matrix X such that:
A + X = 2B + C
Solution :
12. Find the value of x, given that A 2 = B,
Solution: