Given the matrix 2 -4 4-4 -2 -18 2-4 9 -4 3-8 1 -2 -1 -2 -3 -12 Use elementary row operations to carry it to a matrix that is a) In row-echelon form but not in reduced row-echelon form: 0000 Row-echelon form: 0 0 0 0 0000 b) In reduced row-echelon form: 0 0 00 Reduced row-echelon form: 0000 0 0 0 0