# Statements with ln

• Nov 30th 2012, 06:52 AM
itgl72
Statements with ln
In the following practice example Im confused, I think the first and third are true but I am not sure Im doing it right at all. Confused.

Which of the following statements is true, or are none of them true?

ln(x-2) = ln x - ln 2
ln(x-2) = x - ln 2
ln(x-2) = ln(x/2) <- x/2 written as fraction
• Nov 30th 2012, 07:11 AM
topsquark
Re: Statements with ln
Quote:

Originally Posted by itgl72
In the following practice example Im confused, I think the first and third are true but I am not sure Im doing it right at all. Confused.

Which of the following statements is true, or are none of them true?

ln(x-2) = ln x - ln 2
ln(x-2) = x - ln 2
ln(x-2) = ln(x/2) <- x/2 written as fraction

There are really only two things you can do with logarithms:
$ln(ab) = ln(a) + ln(b)$

$ln(a^b) = b \cdot ln(a)$