How to find the inverse of 3x3 matrix? - ProProfs Discuss
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How to find the inverse of 3x3 matrix?

Asked by Lynn , Last updated: Mar 30, 2024

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5 Answers

W. Kaye

W. Kaye

Here to answer and learn

W. Kaye
W. Kaye, Ex-Marine, Post Graduate, Chapel Hill

Answered Sep 28, 2020

It is possible to find the inverse making use of an advanced graphing calculator.

Check the determining factor of the matrix; do this as a first step if the determinant is zero. Your work is done due to the fact that the matrix m can be categorized symbolically as det(m)

Transpose the initial matrix

Transposing numbers signifies reflecting the matrix around the main diagonal.

When transposing the conditions of a matrix, ensure that the central diagonal is not disturbed.

Find the determinant of every one of the 3×3 matrices.

Build a matrix of cofactors. Put the outcome of the final step into a new matrix of cofactors by helping each minor matrix determinant with an equal location in the initial matrix.

Divide each term of the adjugated matrix by determinant and by the value of M.
Put the result of every calculation in place of the first term; the final result is the inverse of the first matrix.

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Victoria Martian

Victoria Martian

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Victoria Martian
Victoria Martian, Blogger, B.com in Journalism, New York

Answered Sep 21, 2020

Inverse operations are frequently used in algebra to simplify complicated equations. They make it seem possible to arrive at the appropriate conclusion.

You can find the inverse using an advanced graphing calculator.

• Test the determining factor of the matrix.

• You should determine the factor of the matrix as an initial step if the determinant is 0.

• Then, your work is completed because the matrix m can be characterized symbolically as det(m).

• Transpose the original matrix.

• Transposing figures means mirroring the matrix about the central diagonal.

• When you transpose the conditions of a matrix, you should see that the main diagonal is unaffected.

• Locate the determinant of each of the 2x2 minor matrices.

• Create a matrix of cofactors.

• Place the results of the last step into a new matrix of cofactors by supporting each minor matrix determinant with the equivalent position in the original matrix.

• Divide each term of the adjugated matrix by the determinant.

• Divide every term of the matrix by the value of M.

• Place the outcome of each calculation into the position of the initial term.

• The end result is the opposite of the initial matrix.

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C. Marcus

C. Marcus

C. Marcus
C. Marcus, Content Developer, Washington

Answered Sep 17, 2020

If you would like to calculate the inverse of a matrix, there are some steps that you have to take to do it successfully.

Some of these steps are the following:

• You first need to know how to calculate the matrix of minors.

• Change this into the matrix of cofactors.

• You also need to find the adjugate.

• Finally, once you have gotten a certain amount, you need to multiply that with 1 divided by the determinant.

Remember that you need to do all of these steps so that you will be able to get the inverse of a matrix successfully.

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H. Barnes

H. Barnes

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H. Barnes
H. Barnes, Unemployed, Barnes, Atlanta

Answered Sep 03, 2020

Knowing the inverse of a 3x3 matrix can be a bit complicated in the beginning, but this is something that you may want to know.

In order to calculate, these are the steps that you can do:

• Calculate the matrix of minors.
• Then you need to turn that to the matrix of cofactors
• Check out the adjugate some people call this adjoint.
• Multiply by 1
• Divide by the available determinant.

Once you have done these calculations, you can be sure that you will be able to multiply the top row elements of the cofactor for the same location. There may be some differences when you need to compute large matrices.

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J. Alfie

J. Alfie

I Write for myself and many other clients. Blog post, Article writing and writing for ProProfs is my daily thing.

J. Alfie
J. Alfie, Content Writer, Masters in Literature, Dallas,Texas

Answered Aug 27, 2020

Operations involving inverses are found in algebra. They are used to simplify a problem that may be very difficult to solve on its own. To solve for the inverse of a 3x3 matrix, follow these steps

• First, the matrix's determinant. If it is zero, then the answer has been found. If not, go on to the next steps

• Then, transpose the first matrix

• Next, find the determinant of the 2x2 matrixes

• Create a matrix with the cofactors

• Divide the terms by the determinants. Some of the sources can also be multiplied to get the result as doing so will result in the same answer.

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