Question

calculate \[\int {t^3e^{-t}}dt\]

Answer 1

By parts seems to be the way to go here...

Answer 2

ok, I try to avoid it, but if there is no way to do. I will. thanks TJ

Answer 3

I don't think there's any other way T.T

Answer 4

Sorry, friend, I 'm lazy when taking int 3 times for this

Answer 5

@terenzreignz I agree with you, using tabular integration would be ideal. Tabular integration is basically integration by parts except for a special case where one function in the integrand can be differentiated to 0 whereas the other can be perpetually integrated.

Answer 6

@genius12 I know that method,(tabular), it's just a part in my differential equation, sigh!!! no choice for me

Answer 7

Good luck :D

Answer 8

Thanks TJ

Answer 9

I have a bunch of homework, try to get a shortcut, hihi...

Answer 10

The tabular method is a shortcut? LOL

Answer 11

no, I know it's not, that's why I posted the question to get other's opinion. Who knows? what if I am lucky., right?

Answer 12

What? I saw genius12 wrote something, why it disappears?

Answer 13

Thanks friends.

Answer 14

@Loser66