Question

Hi all! I have a hairy integral I need help with!
integrate (x^17) times (e^(-x^8))...I have a picture of it so it is easier to understand...Thanks!

Answer 1

I think U Substituion is in order of u=x^18 but i'm not sure how they expect me to just immediately see to use that method...any help?

Answer 2

just saw it!

Answer 3

The integral is
\[\int 18x^7e^{-x^{18}} dx\]
Put
\[x^{18}=u\]
What would you get for du?

Answer 4

Differentiate both sides you'd get something of the form
\[.....dx=du\]

Answer 5

ah thanks frge...i just realized how to do it before you typed in...thank you though for the help!

Answer 6

No problem