Let y = 2(x - 4)2 - 8. Part A: Is the given relation a function? Is it one-to-one? Explain completely. If it is not one-to-one, determine a possible restriction on the domain such that the relation is one-to-one. (5 points) Part B: Determine y-1. Show all necessary calculations. (5 points) Part C: Prove algebraically that y and y-1 are inverse functions. (5 points)