# How to do the inverse matrix in Geogebra

In this lesson I'll explain how to calculate the inverse matrix using Geogebra.

**What is an inverse matrix? **A matrix A is invertible if there is an inverse matrix B, such that the vector product AxB returns an identity matrix.

Create an invertible square matrix.

For example, create a 3x3 matrix with three rows and three columns.

**Note**. If you don't know how to do this, read our previous lesson: how to make a matrix in Geogebra.

Now type the **invert()** function in a new Geogebra field.

Write the name of the matrix you just created between the round brackets.

Geogebra calculates and displays the **inverse matrix**.

**You have calculated the inverse matrix**

To do a quick check, multiply the first matrix (invertible) and the second matrix (inverse).

The result of the vector product is an identity matrix. It is a matrix with the elements equal to 1 in the main diagonal and all the other null elements.

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