Barrett works at an ice cream shop. The function f(x) represents the amount of money in dollars Barrett earns per gallon of ice cream, where x is the number of gallons of ice cream he makes. The function g(x) represents the number of gallons of ice cream Barrett makes per hour, where x is the number of hours he works. f(x) = 2x2 + 4 g(x) = the square root of three times x cubed Find f(g(x)).