Consider the following matrix A, and let B = A-1. Find b31, b32, and b33. (i. e., find the entries in the third row of A-1.

A = 1 1 - 2

-9 - 1 0

-2 - 1 2

The result of operation A - 1 is:

0 0 - 3

-10 - 2 - 1

-3 - 2 1

which is equal to matrix B.

Looking at the third row we have:

b31 = - 3

b32 = - 2

b33 = 1

which are the entries in the third row of A - 1