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# Integration help

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1. Hello,

Can someone help with this integral? Preferably with steps:

integral x^n exp(-x) dx

Between 0 and infinity.
2. What have you tried?
3. (Original post by qrty12)
Hello,

Can someone help with this integral? Preferably with steps:

integral x^n exp(-x) dx

Between 0 and infinity.
?

Are you deriving a reduction formula or finding a limit, or what? Let's see what you've tried.
4. You can find a very simple expression for this integral.First though find a reduction formula. Are you assuming n is a positive integer?
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