nd elementary matrices E1,E2,E3 and E4 such that E4·E3·E2·E1·M = I.
( a )
FM = A where E is elementary
matrices . We want to find inverse of E .
Clearly , we can see that second row
of A is
2 times second row of M.
Row 2 of A =
2 row 2 of M…Math