Precalculus : Find the Difference of Two Matrices

Study concepts, example questions & explanations for Precalculus

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Example Questions

Example Question #163 : Matrices And Vectors

Subtract:

 

Possible Answers:

Correct answer:

Explanation:

In order to subtract matrices, they have to be of the same dimension. In this case, they are both 2x2. 

The formula to subtract matrices is as follows:

Using this formula we plug in our values and solve:

8

Example Question #164 : Matrices And Vectors

Subtract:

 

Possible Answers:

No Solution

Correct answer:

No Solution

Explanation:

In order to subtract matrices, they have to be of the same dimension. In this case, they are not. One is 2x2 while the other is 2x1.

As such, we cannot find their difference. 

The answer is No Solution

Example Question #165 : Matrices And Vectors

Subtract

  

Possible Answers:

Correct answer:

Explanation:

The first step in solving this problem is to multiply the matrix by the scalar.

We then have to make sure we can subtract the matrices.

In order to subtract matrices, they have to be of the same dimension. In this case, they are both 2x2.

Using our new matrix from multiplying the scalar and subtracting it from our other matrix we get the following:

 

Example Question #166 : Matrices And Vectors

We consider the following matrices:

 

Find .

Possible Answers:

We can't find .

Correct answer:

We can't find .

Explanation:

To be able to subtract matrices, the matrices must have the same size.

A is 3x3 and B is 3x4. Therefore we can't perform this operation.

Example Question #26 : Matrices

Given the following matrices, what is the product of  and ?

 

Possible Answers:

Correct answer:

Explanation:

When subtracting matrices, you want to subtract each corresponding cell.

 

 

Now solve for  and 

 

 

Example Question #25 : Matrices

If , what is ?

 

Possible Answers:

Correct answer:

Explanation:

You can treat matrices just like you treat other members of an equation. Therefore, you can subtract the matrix

from both sides of the equation.  This gives you:

Now, matrix subtraction is simple. You merely subtract each element, matching the correlative spaces with each other:

Then, you simplify:

Therefore, 

Example Question #167 : Matrices And Vectors

Possible Answers:

Correct answer:

Explanation:

To find the difference between two matrices with the same dimensions, we simply subtract each entry from the right matrix from the corresponding entry of the left matrix. After performing the operation 9 times, we get the following matrix:

Example Question #168 : Matrices And Vectors

Find the difference if it exists

Possible Answers:

Correct answer:

Explanation:

Because the two matrices have the same dimension, the difference exists

Example Question #1 : Find The Difference Of Two Matrices

Possible Answers:

Correct answer:

Explanation:

To solve this problem, subtract the corresponding numbers in each matrix: . Then, put those answers in the corresponding places in the answer matrix, so that you get: .

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