Question

The domain of f(x) = log2x is x > 0.
true or false

Answer 1

true!
we cannot use x=0 in logs because x=0 means
\[\Large 10^{?}=2\]
means which power of 10 will give answer 2 .you know it is not possible.
so statement is true !

Answer 2

Given a function f(x) and another funtion g(x).
If f(100) = 2 and g(2) = 100, then f and g are ????