(a) find matrix A's inverse,by applying elementary row operations to the partitioned matrix[A\I] A=[1 3 2 ]
[0 -1 0 ]
[3 4 5 ]
(b)using an augemented amtrix(matrix) found in an intermediate step in part (a), explain for which upper and lower triangular matrices U and L (with zero entries below and above the main diagonal respectively) the equation LA=U holds.