# RD Sharma Solutions For Class 12 Maths Exercise 5.2 Chapter 5 Algebra of Matrices

RD Sharma Solutions for Class 12 Maths Exercise 5.2 Chapter 5 Algebra of Matrices is provided here for students to study and prepare for their board exams. Regular practice on a daily basis is the main thing that should be done by the students in the Mathematics field. Highly experienced subject experts having a vast knowledge of concepts prepare the answers, which match the understanding ability of the students.

RD Sharma Solutions for Class 12 can be used by students in order to excel in the subject by obtaining a good academic score. This exercise covers the topic addition of matrices with explanatory answers. RD Sharma Solutions for Class 12 Maths Chapter 5 Algebra of Matrices Exercise 5.2 are provided here.

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### Access answers to Maths RD Sharma Solutions For Class 12 Chapter 5 – Algebra of Matrices Exercise 5.2

1. Compute the following sums:

Solution:

(i) Given

Corresponding elements of two matrices should be added

Therefore, we get

Therefore,

(ii) Given

Therefore,

Find each of the following:

(i) 2A â€“ 3B

(ii) B â€“ 4C

(iii) 3A â€“ C

(iv) 3A â€“ 2B + 3C

Solution:

(i) Given

First we have to compute 2A

Now by computing 3B we get,

Now by we have to compute 2A â€“ 3B we get

Therefore

(ii) Given

First we have to compute 4C,

Now,

Therefore we get,

(iii) Given

First we have to compute 3A,

Now,

Therefore,

(iv) Given

First we have to compute 3A

Now we have to compute 2B

By computing 3C we get,

Therefore,

(i) A + B and B + C

(ii) 2B + 3A and 3C â€“ 4B

Solution:

(i) Consider A + B,

A + B is not possible because matrix A is an order of 2 x 2 and Matrix B is an order of 2 x 3, so the Sum of the matrix is only possible when their order is same.

Now consider B + C

(ii) Consider 2B + 3A

2B + 3A also does not exist because the order of matrix B and matrix A is different, so we cannot find the sum of these matrix.

Now consider 3C â€“ 4B,

Solution:

Given

Now we have to compute 2A â€“ 3B + 4C

5. If A = diag (2 -5 9), B = diag (1 1 -4) and C = diag (-6 3 4), find

(i) A â€“ 2B

(ii) B + C – 2A

(iii) 2A + 3B â€“ 5C

Solution:

(i) Given A = diag (2 -5 9), B = diag (1 1 -4) and C = diag (-6 3 4)

(ii) Given A = diag (2 -5 9), B = diag (1 1 -4) and C = diag (-6 3 4)

We have to find B + C – 2A

Here,

Now we have to compute B + C – 2A

(iii) Given A = diag (2 -5 9), B = diag (1 1 -4) and C = diag (-6 3 4)

Now we have to find 2A + 3B â€“ 5C

Here,

Now consider 2A + 3B â€“ 5C

6. Given the matrices

Verify that (A + B) + C = A + (B + C)

Solution:

Given

Now we have to verify (A + B) + C = A + (B + C)

First consider LHS, (A + B) + C,

Now consider RHS, that is A + (B + C)

Therefore LHS = RHS

Hence (A + B) + C = A + (B + C)

7. Find the matrices X and Y,

Solution:

Consider,

Now by simplifying we get,

Therefore,

Again consider,

Now by simplifying we get,

Therefore,

Solution:

Given

Now by transposing, we get

Therefore,

Solution:

Given

Now by multiplying equation (1) and (2) we get,

Now by adding equation (2) and (3) we get,

Now by substituting X in equation (2) we get,

Solution:

Consider

Now, again consider

Therefore,

And