the 2x4 matrix is

[2+i 2+i 5 6+i

1-2i 1-2i -2+i 2-i ]

the answer for row-echelon form is

[4-3i 4-3i 5-10i 8-11i

0 0 -10+10i -3+11i]

and for reduced row echelon form is

[1 1 0 1.6+0.7i

0 0 1 0.7-0.4i]

i cant figure out what operations to use to get the answers. the exercise says to use an algorithm. By the way i came across this problem in my problem sheet book.