Posted by Jane on Sunday, November 27, 2011 at 6:19pm.
Use integration by parts to find the integral. Round the answer to two decimal places if necessary. (x+4) ln x dx between 3 and 0.
I tried this problem two different ways and got two different answers 1.63 and 3.89. which one is correct? Please.

Calculus  Steve, Sunday, November 27, 2011 at 6:45pm
u = ln x
du = 1/x dx
dv = (x+4) dx
v = x^2/2 + 4x
Int[(x+4)ln x dx] = (x^2/2 + 4x)lnx  Int(x/2 + 4)dx
= (x^2/2 + 4x)lnx  (x^2/4 + 4x)
Evaluating over the interval, we get
[9/2 + 12)ln3  (9/4 + 12)]  [0]
= 33/2 ln3  57/4
= 3.8771

Calculus  Jane, Sunday, November 27, 2011 at 6:48pm
same thing I got, but not even close to any of the answer choices ... 2.69, 16.69, 2.15, and 1.51. This one has me stumped!!
Answer This Question
Related Questions
 Calculus  Use integration by parts to find the integral. Round the answer to ...
 Calculus  Given two problems: Problem A: Tau = Integral(0 to v) v/(q^2  v^2) ...
 math  round result to two decimal places...the answer i have is: 7.023 so two ...
 math  (a) Make a table of values rounded to two decimal places for the function...
 physics  A 4.90 kg particle moves along the x axis. Its position varies with ...
 Trigonometry  Find all solutions between 0 and 2pi. Round to two decimal places...
 Math  What is the difference between "Give your answer correct to two decimal ...
 calc  how do you start this problem: integral of xe^(2x) There are two ways: 1...
 Six grade percent  what number is 15% of 50? I'm working this problem two ...
 Calculus Please Help4  Consider the area between the graphs x+2y=9 and x+6=y^2...
More Related Questions