When looking at the rational function f of x equals the quantity x minus one times the quantity x plus two times the quantity x plus four all divided by the quantity x plus one times the quantity x minus two times the quantity x minus four, bella and edward have two different thoughts. bella says that the function is defined at x = –1, x = 2, and x = 4. edward says that the function is undefined at those x values. who is correct? justify your reasoning.