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March 28, 2024, 10:32:19 pm

Author Topic: Integration by Parts Method  (Read 1761 times)  Share 

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frog1944

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Integration by Parts Method
« on: April 29, 2017, 03:12:40 pm »
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Hi,

When evaluating an integral using integration by parts, is it required for you to write, u = ..., dv = .... etc. Or can you do that in your head or just jot it down on the side of the page in a less formal manner?

Thanks

jakesilove

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Re: Integration by Parts Method
« Reply #1 on: April 29, 2017, 03:45:28 pm »
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Hi,

When evaluating an integral using integration by parts, is it required for you to write, u = ..., dv = .... etc. Or can you do that in your head or just jot it down on the side of the page in a less formal manner?

Thanks

Whilst I don't think it's required that you write out that information, I would strongly recommend that you do. If you do it in your head, you're more likely to make a mistake. Alternatively, if you do mess up your calculation somewhere, you're more likely to receive working marks if you've shown the correct steps. I get that writing out the integration by parts method can be tedious, especially when you've done the same integral so many times. However, I would seriously recommend getting into the habit of doing it everytime!
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RuiAce

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Re: Integration by Parts Method
« Reply #2 on: April 29, 2017, 04:10:06 pm »
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Personally I stopped writing it out after just doing about a week of them.

But I've seen a ton of scenarios where people mess up doing it inside their head. So do whatever you feel is safest for you.

frog1944

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Re: Integration by Parts Method
« Reply #3 on: April 30, 2017, 07:05:20 am »
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Ok, thanks guys :)

jamonwindeyer

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Re: Integration by Parts Method
« Reply #4 on: April 30, 2017, 10:31:16 am »
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Personally I stopped writing it out after just doing about a week of them.

But I've seen a ton of scenarios where people mess up doing it inside their head. So do whatever you feel is safest for you.

I still mess it up doing it in my head in third year lol

GodlyOne

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Re: Integration by Parts Method
« Reply #5 on: April 30, 2017, 10:39:35 am »
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Im pretty sure you would get marks too if you wrote it down.

RuiAce

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Re: Integration by Parts Method
« Reply #6 on: April 30, 2017, 10:43:23 am »
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I still mess it up doing it in my head in third year lol
Ouch...

But yeah, I never wrote my u's and dv's. And I always got marks for it.