f f(x) = 2x2 and g(x) = 3x, what is (g o f)(x)
a. 6x2
b. 9x2
c. 18x2
d. 8x4

I think f(x) is 2x², and I think you're trying to ask for 'g' of 'f of x'.g(x) = 3xg [ f(x) ] = 3 (2x²) = 6x² .That's choice-'a'.