Question

what is the inverse of this square matrix [2 1 4
3 2 5
0 -1 1]

Answer 1

isint just a flip of the values from the diagonal line?

Answer 2

ok I had it wrong at first. the inverse will be the determinant of the matrix times the transpose of the matrix.

Do you know how to find the determinant of the matrix?

the transpose is the flip from the top left to the bottom right diagonal.

Answer 3

This would be a long process to explain, so I think it's best that you follow the example in this link and see if you understand:
http://www.wikihow.com/Inverse-a-3X3-Matrix
If you have any problems, come back and we will help out.

Answer 4

tanx um trying

Answer 5

You also might want to consider the Augmented Matrix method. There you can apply Gauss-Jordan elimination:

\[\Large [A |I] \longrightarrow [I |A^{-1}] \]

Answer 6

get the cofactor matrix, transpose it, then divide it thru by the determinant of the original

Answer 7

gauss jordan is fine too :)