Let A be a 3 x 3 matrix with the following eigenvalues A1, Ag, A3 and corresponding eigenvectors v1, v2, vy: A1 = 3 and v = (-1,0,0)T, A2 = 5 and vg = (1, 1,1), A3 = 8 and v3 = (0,0,2)T. Let v = (7,5, -1)". Find the value of || Av|].