Thank you very much for that!
while we are on the subject, one more problem please
This integrate : -336x(4x+4)^(13) dx
u=-336x du=-336
dv=(4x+4)^(13)
v= (4x+4)^(14)
...... 14
and I got -24x(4x+4)^(14) +24(4x + 4)^(15) + C
.... ................ .................... 60
I think my answer is wrong ?