Perform the following operation:

Question

[ a 1-a [ 5 4 -1
1+a -a ] 3 -3 0 ]

Note: The entries in the resulting matrix are functions of a.

Answer 1

can't decipher your matrices. Maybe write each matrix on its own line.
[x x x]
[x x x]
and so on. Then, what? multiply the two?