6.8. Consider the problem minimize x1 x2 subject to (x1)2 + (x2)2 5 l x 3 0. (a) Starting from the point x = (1, 0) and from the initial value of the La grange multiplier A = l, carry out two iterations of the sequential quadratic programming method. Explain the reasons for using a positive value of the multiplier at the rst iteration. (b) For the same initial point, carry out two iterations of the interior point method