a, b, and c are constants such that the quadratic ax^2 + bx + c can be expressed in the form 2(x-4)^2 + 8. When the quadratic 3ax^2 + 2bx + c(for the same values of a, b, and c) is expressed in the form n(x-h)^2 + k, what is h?

h = -6.