Diketahui Matriks A = ( -2 1 , 3 -1 ) tentukan invers dari matriks tersebut

Rumus invers = 1/detA×adjA

.......| -2....1 |
A = | .3..-1 |

Maka :

.......................1..............| -1.....-1 |
A^-1 = ------------------- .| -3...-2 |
............(-2)(-1) - (1)(3)

...........................|-1....-1|
A^-1 = 1/(2 - 3)..|-3..-2|

....................|-1......-1|
A^-1 = 1/-1...|-3....-2|

................|-1.......-1|
A^-1 = -1.|-3......-2|

............|1.......1|
A^-1 = |3.....2|