Solution 34852: Calculating the Inverse of a Matrix on the TI-83 Plus and TI-84 Plus Family of Graphing Calculators.
How do I calculate the inverse of a matrix on the TI-83 Plus and TI-84 Plus family of graphing calculators?
The example below will show how to calculate the inverse of a square matrix.
For Example: Find the inverse of matrix A
First enter the matrix:
1) Press [2nd] [MATRX] to enter the matrix menu.
2) Press [Left Arrow] to scroll to EDIT.
2) Press  to edit Matrix A
3) Input the dimensions of the matrix  [ENTER]  [ENTER]
4) Input the values for the elements of the matrix  [ENTER]  [ENTER]  [ENTER]  [ENTER]
5) Press [2nd] [QUIT] to return to the home screen
To find the inverse of matrix A
6) Press [2nd] [MATRX]  [x-1] [ENTER]
Please Note:A singular matrix does not have an inverse. A singular matrix by definition is a matrix whose determinant equals zero.
Please see the TI-83 Plus and TI-84 Plus Family guidebooks for additional information.
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