# logs and expo

• December 21st 2009, 11:15 AM
math321
logs and expo
Write each expression as a sum and/or difference of logarithms. Express powers as factors and simplify where necessary

ln(x/(e^x))

this is wat i did

ln x - loge e^x

lnx - x
• December 21st 2009, 11:25 AM
e^(i*pi)
Quote:

Originally Posted by math321
Write each expression as a sum and/or difference of logarithms. Express powers as factors and simplify where necessary

ln(x/(e^x))

this is wat i did

ln x - loge e^x

lnx - x

Yep, no problem there
• December 21st 2009, 11:28 AM
Raoh
Quote:

Originally Posted by math321
Write each expression as a sum and/or difference of logarithms. Express powers as factors and simplify where necessary

ln(x/(e^x))

this is wat i did

ln x - loge e^x

lnx - x

yes,you're right.

$\ln(\frac{x}{e^x})=\ln x-x$
$\ln$ is the natural logarithm.
$x$ is strictly positive.