# [SOLVED] Just need help setting up the equation

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• March 9th 2010, 09:54 PM
vinson24
[SOLVED] Just need help setting up the equation
In the section of integration by parts
Find the area of the region enclosed by y=lnx, the line x=e and the x-axis
• March 9th 2010, 09:58 PM
Prove It
Quote:

Originally Posted by vinson24
In the section of integration by parts
Find the area of the region enclosed by y=lnx, the line x=e and the x-axis

I expect that this is the region enclosed by the function, the line $x = e$ and the $x$ intercept of the function (which is $x = 1$).

So you are evaluating

$\int_1^e{\ln{x}\,dx} = \int_1^e{1\cdot \ln{x}\,dx}$.

Now set $u = \ln{x}$ and $dv = 1$.
• March 9th 2010, 10:03 PM
vinson24
thanks i had the integral set from 0 to e and was getting the wrong answer