. Let f(x) and g(x) be polynomial functions such that f(x)= x¹ - 2x³ - 4x² +5 and g(x)= x² + 1, then a. f(x) + g(x) b. f(x) - g(x) c. f(x) x g(x) d. f(x) + g(x) e.2f(x) - 4g(x) of rand r? in the product of (x³ - x² + x - 2) (x³ - x²-3).​