Matrices

Cramer’s rule

On this post we explain what Cramer’s rule is and, in addition, you will find examples and exercises of systems of equations solved by Cramer’s rule. Cramer’s rule formula Cramer’s rule is a formula used to solve systems of linear equations using determinants. Let’s see how to use the Cramer’s rule: Given a system of …

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Hessian matrix

On this post we explain what the Hessian matrix is and how to calculate it (with examples). Also, you will find several solved exercises so that you can practice. In addition, you will see all the applications of the Hessian matrix. And finally, we will show you what the bordered Hessian matrix is. What is …

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Involutory matrix

On this post we explain what an involutory matrix is. We also show you examples of 2×2, 3×3 and 4×4 involutory matrices. And finally, you will find the formula of an involutory matrix and all the properties of this type of matrices. What is an involutory matrix? The definition of involutory matrix is as follows: …

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Gaussian elimination method

On this post you will learn what the Gaussian elimination method is and how to solve a system of equations by the Gaussian elimination method. What is the Gaussian elimination method? The Gaussian elimination method, also called row reduction method, is an algorithm used to solve a system of linear equations with a matrix. The …

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Inverse of a matrix

We explain what the inverse of a matrix is and how to find it. You will learn the formulas to calculate the inverse of a 2×2 matrix and the inverse of a 3×3 matrix. Also, you will see several solved examples. And finally, we explain the properties of the inverse matrix. What is the inverse …

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Cofactor matrix

In this post we explain what the cofactor matrix is and how to find it. Also, you’ll find examples of 2×2 and 3×3 cofactors matrices, so that you can perfectly understand how to compute the cofactor matrix. However, to comprehend the cofactor matrix, you need to know what a cofactor is. So, first we’ll see …

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Properties of determinants

On this post we are going to see all the properties of determinants. We explain each property with an example so that you understand them perfectly. In addition, you will find solved exercises of the properties of determinants. All properties of determinants Determinant of the transpose of a matrix The determinant of a matrix is …

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