Question

∫ t * e^(-st) dt help?

Answer 1

integration by parts.

Answer 2

\(u=t\quad dv=e^{-st}dt\)

Answer 3

Do you need more help?

Answer 4

yes

Answer 5

please

Answer 6

Ok do you know the integration by parts formula?

Answer 7

yes I know, but my result is zero

Answer 8

So what are you using for u, du, dv & v ?

Answer 9

u = t; du = 1dt and dv = e^(-st)dt v = -s*e^(-st)

Answer 10

now my result is -e^(-st) * (st+1)

Answer 11

but the response is [-e^(-st)*(st+1)] / s^2

Answer 12

I got.