Question

What is the domain of f(x) = log(x) - 5?
Answer
a. x < 0
b. x > 1
c. x > 0
d. All real numbers

Answer 1

The answer is C !

Answer 2

It's not A. You can't have a negative value inside the log, because theres no power you can raise a positive value to to get a negative number. The answer should be x>0, since x can't be negative.

Answer 3

Half awake, that's why.

Answer 4

We have :
\[\log x-5 \text{ is defined}\iff \log x\text{ is defined}\iff x>0\]