# Math Help - logarithm

1. ## logarithm

what is the domain of log subscript 9 x? (x is normal sized)

2. Originally Posted by FinalFantasy9291
what is the domain of log subscript 9 x? (x is normal sized)
The base is irrelevant. I'll assume we're working in the reals. The domain is x > 0 because otherwise the logarithm is undefined.