Let A e Rmxn, b e Rm, rankA = m and X, E R". Consider the following optimization problem: minimize || 2 30|| subject to Ar = b. Show that this problem has a unique solution given by: #* = A(AAT)-46+(I. - AT(AAT)--A)X, Let A e Rmxn, b e Rm, rankA = m and X, E R". Consider the following optimization problem: minimize || 2 30|| subject to Ar = b. Show that this problem has a unique solution given by: #* = A(AAT)-46+(I. - AT(AAT)--A)X