Two functions are added together such as if x=2 the result is 15. Which of the following will satisfy this constraint. A) f(x) = x³ + 3x² + 2 and g(x) = 10. B) f(x) = x² + 3x and g(x) = 12. C) f(x) = x³ + 3x + 5 and g(x) = 10. D) f(x) = x³ + 3x + 2 and g(x) = 5.
