Transform 2 exponential functions
f(x) = e^ (2x)
g(x) = e^(2(x - 6))
Apply exponents rule:
A^ (B-C) = A^B/A^C
Then
e^(2(x - 6)) = e^2x / e^12
Now transform x to (x-6)
Shift x 6 units to the left, because have minus sign
Therefore OPTION C is right answer