which of the following functions are polynominal functions
a. f(x) = 4x²+2
b. f(x) = 3x³ - 2x +√x
c. f(x) 12- 4x⁵ + 3x²
d. f(x) = 3x¹² - 2/x
e. f(x) = 3x¹¹ - 2x¹²