Question

What is the domain of f(x)=log(x)+7?

Answer 1

f(x)=log(x)+7 is {x element R : x>0} (all positive real numbers) (assuming a function from reals to reals).

Answer 2

Thank you! =) So my answer would be x>0

Answer 3

Are there any other values to the problem?

Answer 4

7

Answer 5

so x>7

Answer 6

Here's an example:
the domain of log u is u > 0

thus, the domain of log (49 - x^2) is 49 - x^2 > 0

(7 - x)(7 + x) > 0
this happens when either both factors are positive, or both are negative

in this case, the domain is (-7 , 7), or -7 < x < 7

Answer 7

Whoops, I meant to type it x<7 =) Thank you!!

Answer 8

your welcome