1 5 PROBLEM 4 (7 pts.) Find an invertible, 2 x 2 matrix 7, such that 7-AT is diagonal, where A = 6 Hint: note that A is triangular, hence its eigenvalues are on the diagonal. In order to compute T, you must find two (linearly independent) eigenvectors of A, call them vi, v2. It follows that T |vi 62