Find the inverse of A.

need help!

Find the inverse of A.

A = the following ...

------ 1 ---- -2 ----- -1
------ 3 ---- -5 ----- -6
----- -1 ---- 5 ----- -7

set up a matix: [1 2 -1 1 0 0 and use row reduction to get the left side to be [1 0 0
3 -5 -6 0 1 0 0 1 0
-1 5 -7 0 0 1] 0 0 1]
the matrix left on the right is the inverse....id recommend looking online for a more comlete answer. You can also use a calculator to find the inverse. Just input a matrix and do the command [A]^-1