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I can't get the answers they give. I keep getting

(1) 1/2 x^2 lnx - 5x lnx - 1/4 x^2 + 5x + c

u=lnx

du=1/x dx

dv=x-5

v=x^2/2 - 5x

lnx (x^2/2 - 5x) - int (x^2/2 -5x)(1/x) dx

lnx (x^2/2 - 5x) - int (x/2 - 5) dx

lnx (x^2/2 - 5x) - x^2/4 + 5x + C

1/2x^2 lnx - 5x lnx - 1/4 x^2 + 5x +C

What am I doing wrong?

Also this one has been giving me trouble

http://www.flickr.com/photos/47939227@N03/4528886766/

I keep getting

2/3 x (x^2+6)^3/2 - 4/5(x^2+6)^5/2 + C

(2) int (2x^3) (x^2 + 6)^1/2

u=2x^3

du=6x^2 dx

dv= (x^2 + 6)^1/2

v=(x^2 + 6)^3/2

--------------

3x

2/3 x (x^2 + 6)^3/2 - int ((x^2 + 6)^3/2 (6x^2)) /(3x)

2/3 x (x^2 + 6)^3/2 - int (x^2 + 6)^3/2 (2x)

2/3 x (x^2 + 6)^3/2 - 4/5 x (x^2 + 6)^5/2 + C

What am I doing wrong with this one?

Thank you very much for any help.