Chapters

## Exercise 1

Given the matrices:

Calculate:

;

;

;

.

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## Exercise 2

Prove that: where:

Given the matrix

Find:

1.

2.

3.

## Exercise 4

Determine the matrix that is needed to premultiply by the matrix in order to obtain the matrix .

## Exercise 5

Find all matrices that commute with the matrix:

## Exercise 6

Determine the matrices A and B that verify the system:

## Exercise 7

A factory produces two models of washing machines, A and B, in three available finishes: N, L, and S. Model A is produced in 400 units in Finish N, 200 units in Finish L, and 50 units in Finish S. Model B is produced in 300 units in Finish N, 100 units in Finish L and 30 units in Finish S. Finish N takes 25 hours of workshop time to complete and 1 hour of administration. Finish L takes 30 hours of workshop time and 1.2 hours of administration. Finally, Finish S takes 33 hours of workshop time and 1.3 hours of administration.

1.Represent the information in two matrices.

2.Find a matrix that expresses the hours of workshop and administration time needed for each of the models.

## Exercise 8

A furniture company manufactures three different models of shelves: A, B, and C. Each of these models is offered in both large and small sizes. Every day, the factory produces large and small shelves in Type A, large and small shelves in Type B, and large and small shelves in Type C. Regardless of the type, each large shelf has screws and supporting brackets while each small shelf has screws and supporting brackets.

1. Represent this information in two matrices.

2. Find a matrix that represents the number of screws and supports brackets necessary for the daily production of each of the six model-sized shelves.

## Exercise 9

Given the matrices:

Calculate the value of X in the following equations:

1.

2.

3.

4.

5.

## Solution of exercise 1

Given the matrices:

Calculate:

;

;

;

.

## Solution of exercise 2

Prove that: where:

Given the matrix

Find:

1.

2.

3.

## Solution of exercise 4

Determine the matrix that is needed to premultiply by the matrix in order to obtain the matrix .

## Solution of exercise 5

Find all matrices that commute with the matrix:

## Solution of exercise 6

Determine the matrices A and B that verify the system:

Multiply the second equation by −2

Add member to member

If the first equation is multiplied by 3 and the members are added, the result is:

## Solution of exercise 7

A factory produces two models of washing machines, A and B, in three available finishes: N, L, and S. Model A is produced in 400 units in Finish N, 200 units in Finish L, and 50 units in Finish S. Model B is produced in 300 units in Finish N, 100 units in Finish L and 30 units in Finish S. Finish N takes 25 hours of workshop time to complete and 1 hour of administration. Finish L takes 30 hours of workshop time and 1.2 hours of administration. Finally, Finish S takes 33 hours of workshop time and 1.3 hours of administration.

1.Represent the information in two matrices.

2.Find a matrix that expresses the hours of workshop and administration time needed for each of the models.

Matrix production:

Rows:   Models A and B          Columns:  Completions N, L, S

Cost matrix in hours:

Rows: Finishes N, L, S   Columns: Cost in hours: T, A

Matrix that expresses the hours of workshop and administration for each of the models:

## Solution of exercise 8

A furniture company manufactures three different models of shelves: A, B, and C. Each of these models is offered in both large and small sizes. Every day, the factory produces large and small shelves in Type A, large and small shelves in Type B, and large and small shelves in Type C. Regardless of the type, each large shelf has screws and supporting brackets while each small shelf has screws and supporting brackets.

1. Represent this information in two matrices.

Rows:   Models A, B, C                  Columns:  Types L, S

Matrix elements of the shelves:

Rows:  Types L, S                  Columns:  T, S

2. Find a matrix that represents the number of screws and supports brackets necessary for the daily production of each of the six model-sized shelves.

The matrix that expresses the number of screws and supporting brackets for each shelf model:

## Solution of exercise 9

Given the matrices:

Calculate the value of X in the following equations:

1.

2.

3.

4.

5.

1.

2.

3.

4.

5.

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Emma

I am passionate about travelling and currently live and work in Paris. I like to spend my time reading, gardening, running, learning languages and exploring new places.