## Calculate adjoint matrix step by step

The calculator will find the adjoint (adjugate, adjunct) matrix of the given square matrix, with steps shown.

If the calculator did not compute something or you have identified an error, or you have a suggestion/feedback, please write it in the comments below.

The Adjoint Matrix Calculator is a highly proficient tool designed to simplify your calculations involving matrices. Our goal is to break down complex concepts of linear algebra into understandable chunks, making learning easier and more efficient.

## How to Use the Adjoint Matrix Calculator?

• ### Input

Start by inputting the elements of your matrix in the cells.

• ### Calculation

Click the "Calculate" button. The calculator will then instantly compute the adjoint of your input matrix.

• ### Result

The result, which is the adjoint matrix, will be displayed, accompanied by a thorough breakdown of each computational step.

## What Is an Adjoint Matrix?

An adjoint matrix, often referred to as an adjugate matrix, is the transpose of a given square matrix's cofactor matrix. To clarify, to obtain the adjoint or adjugate of a matrix, you need to replace each matrix element with its respective cofactor and then transpose the resulting matrix.

In formulaic terms, if $A=\left[a_{ij}\right]$ is an $n\times n$ matrix, the cofactor $C_{ij}$ of $a_{ij}$ is calculated as $(-1)^{i+j}$ times the determinant of the $(n-1)\times(n-1)$ matrix left after removing the $i$-th row and $j$-th column from $A$. The adjoint of $A$ is then the transpose of the cofactor matrix $C=\left[C_{ij}\right]$, which can be written as $\operatorname{adj}(A)=C^T$.

Adjoint matrices are particularly significant in computing the inverse of a matrix, as well as in other areas of linear algebra.

Let's explore an example using a 2x2 matrix $A$:

$$\left[\begin{array}{cc}2&3\\4&5\end{array}\right]$$

The process to find the adjoint of $A$ involves the following steps:

1. Find the matrix of cofactors: For a 2x2 matrix, the matrix of cofactors is obtained by swapping the elements on the main diagonal (top-left to bottom-right), swapping the elements on the secondary diagonal and changing the sign of the elements on this diagonal. This gives us:

$$\operatorname{cof}(A)=\left[\begin{array}{cc}5&-4\\-3&2\end{array}\right]$$
2. Transpose the matrix of cofactors: Transposing the matrix of cofactors gives us the adjoint of $A$. The transpose of a matrix is obtained by interchanging its rows and columns. This results in:

$$\operatorname{adj}(A)=\left[\begin{array}{cc}5&-3\\-4&2\end{array}\right]$$

So the adjoint of the matrix $A$ is $\left[\begin{array}{cc}5&-3\\-4&2\end{array}\right]$.

## Are the Adjoint and Transpose the Same?

No, the adjoint and transpose of a matrix are not the same. They are distinct concepts in linear algebra, but they are related in the case of the adjoint matrix.

1. Transpose of a Matrix: The transpose of a matrix is obtained by interchanging its rows and columns. If the original matrix is denoted as $A$, its transpose is usually denoted as $A^T$ or $A'$.
2. Adjoint of a Matrix: The adjoint (or adjugate) of a matrix is the transpose of the cofactor matrix of the original matrix. If the original matrix is denoted as $A$, its adjoint is usually denoted as $\operatorname{adj}(A)$.

So while both operations involve some form of swapping rows and columns, the adjoint operation additionally involves replacing each element with its cofactor before the transposition.

## Why Choose Our Adjoint Matrix Calculator?

• ### Simplify Complex Calculations

Our calculator takes the complexity out of computing adjoint matrices, providing an efficient and hassle-free solution for your matrix calculations.

• ### Comprehensive Results

Along with the adjoint matrix, our calculator offers a comprehensive breakdown of each step involved in the calculation. This enables you to grasp the underlying concepts and improve your understanding of linear algebra.

• ### Accurate and Reliable

With advanced computational algorithms, our calculator ensures accurate results, giving you confidence in the results of your matrix calculations.

• ### Convenient and Accessible

Access our Adjoint Matrix Calculator online at any time and from anywhere, providing you with a convenient tool for solving matrix problems on the go.

### FAQ

#### Does the calculator provide explanations along with the results?

Yes, our Adjoint Matrix Calculator not only provides the adjoint matrix but also offers a step-by-step explanation of the calculation process. This allows you to understand each calculation and enhance your knowledge of linear algebra.

#### How do I calculate the adjugate of a product of matrices?

To find the adjugate of the product of two matrices $A$ and $B$, you can calculate the adjugate of each matrix individually and then multiply them in reverse order. In mathematical terms, $\operatorname{adj}(AB)=\operatorname{adj}(B)\operatorname{adj}(A)$.

#### How do I calculate the adjugate of a matrix power?

When calculating the adjugate of a matrix raised to a power, first find the adjugate of the original matrix and then raise it to the desired power.

#### Can I calculate the adjoint of any matrix?

No, the adjoint matrix can be found only for square matrices. Whether it's a 2x2, 3x3, or larger matrix, the calculator will compute the adjoint matrix accurately.