Question

How do you evaluate `log_7 (-49)`?

Answer 1

`log_7 (-49) "is undefined"` in `RR`.

Answer 2

undefined

Explanation:

`y=log_7(-49)`. Then `y` is the number such that `7^y=-49`.

There is no real number `y` that makes `7^y=-49` true, so it is undefined.

`logx` is undefined for `x<=0`.