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September 29, 2025, 08:16:14 am
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Author Topic: Blakhitman's Questions!  (Read 12766 times)  Share 

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Blakhitman

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Blakhitman's Questions!
« on: January 26, 2010, 03:54:51 pm »
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Hey,

Quick question,  say I'm differentiating:

Can I leave the answer as

Or should I expand it to get

If I leave it at the first answer, will I get full marks?

Thanks!
« Last Edit: February 06, 2010, 12:29:35 am by Blakhitman »
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naved_s9994

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Re: When to stop simplifying?
« Reply #1 on: January 26, 2010, 05:04:29 pm »
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Look.. Theyare technically both correct. So you should get the marks..But markers usually prefer the expanded version
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Blakhitman

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Re: When to stop simplifying?
« Reply #2 on: January 26, 2010, 05:45:50 pm »
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Thanks. Yeah I usually expand anyway, I forget sometimes, so I'm just making sure.
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/0

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Re: When to stop simplifying?
« Reply #3 on: January 26, 2010, 06:45:55 pm »
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Simplification is a pretty trivial issue. As long as it's within reason then it should be ok. That is, of course unless the question specifically asks you to 'express in factored form' etc.
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Blakhitman

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Re: When to stop simplifying?
« Reply #4 on: January 27, 2010, 01:46:03 am »
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Yea, exactly what I was thinking, 'within reason'.

Thanks.
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jimmy999

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Re: When to stop simplifying?
« Reply #5 on: January 27, 2010, 05:41:10 pm »
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Both answers would get you the marks. However if you choose to expand it, then you might make a mistake in your expansion thus losing you a mark. If your answer ends up in factored form, leave it like that, or if it's in expanded form, leave it like that. However if the question explicitly asks you to leave it in a certain form, then you must put it in that form or you will lose a mark
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superflya

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Re: When to stop simplifying?
« Reply #6 on: January 27, 2010, 05:45:22 pm »
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Quote from: jimmy999 on January 27, 2010, 05:41:10 pm
Both answers would get you the marks. However if you choose to expand it, then you might make a mistake in your expansion thus losing you a mark. If your answer ends up in factored form, leave it like that, or if it's in expanded form, leave it like that. However if the question explicitly asks you to leave it in a certain form, then you must put it in that form or you will lose a mark

+1

Edit: 500 posts :D
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Blakhitman

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Re: Blakhitman's Questions!
« Reply #7 on: February 06, 2010, 12:34:34 am »
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Show that has repeated factors.

need help on how to start this...I've been trying and it's late and I'm going to sleep so I better find help tomorrow!!!!!!  :knuppel2:

Please and thanks :) .
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the.watchman

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Re: Blakhitman's Questions!
« Reply #8 on: February 06, 2010, 08:57:03 am »
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I've just tried it, but there definitely doesn't seem to be any repeated factors.
Then again, that could just be my mistake...
« Last Edit: February 06, 2010, 09:36:51 am by the.watchman »
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Blakhitman

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Re: Blakhitman's Questions!
« Reply #9 on: February 06, 2010, 09:48:42 am »
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Oh damn, mistyped equation ><.



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the.watchman

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Re: Blakhitman's Questions!
« Reply #10 on: February 06, 2010, 09:51:28 am »
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LOL, that may turn out a bit better! Let's see:

Because , divide by





So there is always a repeated factor of (x-3)
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the.watchman

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Re: Blakhitman's Questions!
« Reply #11 on: February 06, 2010, 09:55:41 am »
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Actually I just saw a shortcut:

The final term of c(x) is
« Last Edit: February 06, 2010, 01:02:47 pm by the.watchman »
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Blakhitman

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Re: Blakhitman's Questions!
« Reply #12 on: February 06, 2010, 10:07:50 am »
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Thanks a lot!

Appreciate it!
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the.watchman

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Re: Blakhitman's Questions!
« Reply #13 on: February 06, 2010, 01:03:15 pm »
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Edit
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Re: Blakhitman's Questions!
« Reply #14 on: February 06, 2010, 01:05:51 pm »
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Quote from: the.watchman on February 06, 2010, 09:55:41 am
Actually I just saw a shortcut:

The final term of c(x) is

Not necessarily. The final term can also be , you have to use the factor theorem to check.
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