Question

First make a substitution, then integrate by parts to evaluate the integral:
integral of x*ln(1+x) dx

Answer 1

u = x^2/2
v = ln(1+x)

Answer 2

isn't that just going straight into integration by parts?

Answer 3

oh, by substitution do they really mean a 'substitution method' ?

Answer 4

text is asking to make a u-sub, then integrate that new integrand. It's confusing me - is it just a fancy way of saying integrate by parts anyway?

Answer 5

yes

Answer 6

now u making me doubt... wid that u-sub first... lol

Answer 7

it can be solved that way it's all over the net, but using sub method first is nowhere to be found

Answer 8

i dont see any advantage in u-sub in any way -.-

Answer 9

lol i don't either, I'll ask professor thanks anyway

Answer 10

okie