Question

If A matrix 1 0 1
0 2 3
1 2 3
then verify A (adj A) = A determinant I

Answer 1

Answer:

Given matrix A=⎣⎢⎢⎡131−1002−23⎦⎥⎥⎤

Cofactors of matrix A

F11=+∣∣∣∣∣∣00−23∣∣∣∣∣∣=0F12=−∣∣∣∣∣∣31−23∣∣∣∣∣∣=−11F13=+∣∣∣∣∣∣3100∣∣∣∣∣∣=0F21=−∣∣∣∣∣∣

Step-by-step explanation:

Given matrix A=⎣⎢⎢⎡131−1002−23⎦⎥⎥⎤

Cofactors of matrix A

F11=+∣∣∣∣∣∣00−23∣∣∣∣∣∣=0F12=−∣∣∣∣∣∣31−23∣∣∣∣∣∣=−11F13=+∣∣∣∣∣∣3100∣∣∣∣∣∣=0F21=−∣∣∣∣∣∣