Please try to explain the answer.
Which of the following functions is equivalent to the function below?

Select two that apply. f(x) = 3^(2x+1)

g(x )= 3 ⋅ 9^x

g(x )= 3^(2x) + 3

g(x )= 27^x

g(x) = 2 ⋅ 3^(x) + 1

g(x )= (1/3)^(−(2x+1))

g(x) = 9^(x) + 1