A company distributes its product by train and by truck. The cost of distributing by train can be modeled as -0.06x2 + 35x - 135, and the cost of distributing by truck can be modeled as -0.03x2 + 29x - 165, where x is
the number of tons of product distributed. Write a polynomial that represents the difference between the cost of
distributing by train and the cost of distributing by truck.