Find f(x)·g(x) if f(x) = 3x and g(x) = x + 1.

A. 3x2 + 3x
B. 3x + 1
C. 4x + 1
D. 3x2 + 1
A

f(g(x))=3(x+1)

g(f(x))=3x+1
so, none of the answers are correct.