# Inverse, cofactors and adjoint of a 3 by 3 Matrix

This calculator finds the matrix of cofactors, the adjoint matrix and the exact and approximate inverse matrix of a 3 by 3 given matrix.

How to use the calculator
Enter the values in the cells of the top matrix.(decimal, fraction of the form a/b and whole numbers as shown in the example below, are accepted) then press enter.

 row 1-1/3 , 2 , 3.1 row 20 , 4/5 , 5/3 row 31 , -1/3 , 6 Decimal Places = 5(Change to the number of decimals desired) Matrix of Cofactors row 1 , , row 2 , , row 3 , , AdjointT Matrix (Transpose of the matrix of cofactors) row 1 , , row 2 , , row 3 , , Inverse Matrix(Exact) row 1 , , row 2 , , row 3 , , Inverse Matrix(Approximate) row 1 , , row 2 , , row 3 , ,
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