When looking at a rational function f of x equals the quantity x minus six times the quantity x plus three times the quantity x plus four all divided by the quantity x plus six times the quantity x minus three times the quantity x minus four, jamal and angie have two different thoughts. jamal says that the function is defined at x = –6, x = 3, and x = 4. angie says that the function is undefined at those x values. who is correct? justify your reasoning.