1. Find the change of variable x = Py that transforms the quadratic form x Ax into y Dy as shown: 517 + 623+ 713 + 4.1 12 - 4.213 - 947 + 692 + 392 2. Let Q(x) = 5x7 + 623 + 713 + 4102 - 40213 Find the maximum value of Q(x), subject to the constraint x x = 1, and a unit vector u where this maximum is attained. Then find the maximum value subject to the additional constrain that xu = 0