Question

What is the inverse of:
( -1 -4 1;
-1 1 -1
1 1 0) ?????

Answer 1

find cofactor of each element....then take the transpose of co-factor matrix..and divide it by adj A..its lengthy...i will answer it later if no one does..

Answer 2

\[\left[\begin{matrix}1 & 1 & 3\\ -1 & -1 & -2\\-2 & -3 &-5\end{matrix}\right]\]

Answer 3

row reduction would be faster

Answer 4

\[[A|I]\rightarrow[I|A^{-1}]\]