Use elementary row operation to determine the reduced row echelon form of the following matrices. Show work by hand and check your answer using MATLAB's rref command (2pt each). [1 2 3 2 5 6 3 4 8] [1 1 2 2 1 1 1 0 - 1] Find the value of the determinant only. Show hand calculation and check answer with MATLAB (2pt each). [2 - 1 1 1 3 2 3 2 3] [1 1 1 - 1 1 - 1 - 1 1 2 1 - 1 2 3 1 2 - 1]