2. D(x) is the price, in dollars per unit, that consumers are willing to pay for x units of an item, and S(x) is the price, in dollars per unit, that producers are willing to accept for x units. D(x) = (x - 4)2, S(x) = x2+2x+6 a. Find the equilibrium point. b. the consumer surplus at the equilibrium point. c. the producer surplus at the equilibrium point