Question

How do you simplify `9^(log_9x)`?

Answer 1

`9^(log_9 x)=x`

Explanation:

Let `9^(log_9 x)=u`, then as `a^n=b` means `log_a b=n`, we have

`log_9 u=log_9 x`.

Hence `u=x` and `9^(log_9 x)=x`