I need to integrate (x^4)(e^-x) but am not sure what rule it is. Thanks.
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Have you tried integration by parts?
Originally Posted by Siron Have you tried integration by parts? See I thought it was obviously this but then it didn't work out, unless I made a momentous miscalculation somewhere. EDIT: Oh no wait by parts does work, it just takes a lot of workings.
Can you show some work? Proably you'll need integration by parts 4 times. We have: Now you have to apply integration by parts again to calculate: etc ...
Originally Posted by Siron Can you show some work? Proably you'll need integration by parts 4 times. We have: Now you have to apply integration by parts again to calculate: etc ... Thanks for your time, I just reworked it and got the correct answer, I must have gone wrong somewhere.
You're welcome In fact it's not difficult, you just have to pay attention with the signs etc ...
Originally Posted by Siron You're welcome In fact it's not difficult, you just have to pay attention with the signs etc ... Yeah it's easy, I have a habit of working too fast when patience is required. :P
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