7.12. Given the nonlinear program Minimize f(x) = x + xz + x3 Subject to 8,(x) = 1 - xz'xz > 0 82(x) = x; - X; > 0 h (x) = x; – x3 + x2x3 - 4 = 0 0 < x < 5 0 < x < 3 0 < x; <3 What transformations are necessary in order to use the complex method? Give the final transformed form.