Find the equivalent function to f(x) = 3(6)^2x

This is the concept of algebra, the function given can be written as follows;
f(x)=3(6)^(2x)
f(x)=3(6^2)^x
when we expand the above we get:
f(x)=3(36)^x
the answer is f(x)=3(36)^x

Maybe the answer is 20mm. all i really did was just multiply, which is obvious.