Find the Sum or Difference of Two Matrices - Pre-Calculus

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

Now solve for and

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:

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

The formula to add matrices is as follows:

Plugging in our values to solve we get:

The first step in solving this problem is to multiply the matrix by the scalar. The formula is as follows:

In order to add matrices, they have to be of the same dimension.

In this case, they are both 2x2. So, we can then add the matrices together. The result is as follows:

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:

We can perform the addition since the matrices have the same sizes.

Looking at the first row of entries we get:

Note that any entry in the sum of is equal to .

Thus the sum becomes:

Note: For addition of matrices, we do it componentwise.

Note: Adding the first two columns of and we obtain for every row of the first column of the resulting matrix.

In all other case, we obtain 0 everywhere. This gives the matrix:

Adding componentwise (adding entry by entry) we obtain zeros everywhere except for the last row where we get to obain in every component of the row.

This gives the matrix:

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.

Since A and B have the same size, we can perform addition.

The addition is performed componentwise.

The entry located at (i,j) of matrix A is added to the entry located at (i,j) of the matrix B.

In this case i=1 and j=1, 2 ,3 ,4,5

performing this operation we obtain:

Since A and B have the same size, we can perform addition.

The addition is performed componentwise.

The entry located at (i,j) of matrix A is added to the entry located at (i,j) of the matrix B.

Performing this operation we obtain:

Since we are assuming that the two matrices have the same size, we can performthe matrices addition.

We know that when adding matrices, we add them componenwise. Let (i,j) be any entry of the addition matrix. We add the entry from A to the entry from B:

since the entries from A are the same and given by 1 and the entries from B are the same and given by , we add these two to obtain :

and we know that m is odd integer, hence .

Therefore the entry of the sum matrix is 0

Therefore our matrix is given by:

Matrix addition is very easy! All that you need to do is add each correlative member to each other. Think of it like this:

Now, just simplify:

There is your answer!

Matrix addition is really easy—don't overthink it! All you need to do is combine the two matrices in a one-to-one manner for each index:

Then, just simplify all of those simple additions and subtractions:

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,

Since the dimensions of the two matrices are equal the sum of the two matrices exists.

To find the sum, add each component entry from the first matrix to the same component entry of the second matrix.

Because the dimensions of the two matrices are not equal

(A 2x2 matrix is not of the same dimension as a 3x2 matrix)

The sum does not exist.

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:

To find the sum of two matrices, we simply add each entry from one matrix to the corresponding entry of the other matrix, and the result becomes the entry in the same location of the matrix for their sum: