When X = 3, the slope of the function f(x) = 4 + x + 2x^2 is? Set X is the domain of two functions [math]f(x) = x^2−x−4[/math] , [math]g(x) = 2x^3−9x[/math]. If [math]f = g[/math], what is the maximum number of the elements of [math]X?[/math]