Question from GR9768 question (1)

Forum for the GRE subject test in mathematics.
ajf
Posts: 6
Joined: Mon Aug 31, 2009 1:43 am

Question from GR9768 question (1)

Postby ajf » Mon Aug 31, 2009 1:51 am

I'm just starting my review of math for the GRE subject test. Anyway, the first question on GR9768 shows

F(x) = integrate log(t) from e to x

I think the answer is

xlog(x) - x

However, the answer key shows that it is (c) which is

log(x)

Can someone point out the correct answer and why? Thanks in advance for the help.

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lime
Posts: 129
Joined: Tue Dec 04, 2007 2:11 am

Re: Question from GR9768 question (1)

Postby lime » Mon Aug 31, 2009 2:29 pm

Read the question carefully. It was asking about the derivative - F'(x), not F(x).

ajf
Posts: 6
Joined: Mon Aug 31, 2009 1:43 am

Re: Question from GR9768 question (1)

Postby ajf » Tue Sep 01, 2009 12:34 am

Well, this is embarrassing. One lesson that I can learn from this is to read the questions carefully. Thank you for the help.

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diogenes
Posts: 73
Joined: Sun Aug 31, 2008 9:31 pm

Re: Question from GR9768 question (1)

Postby diogenes » Tue Sep 01, 2009 12:35 am

Hey, at the very least it made for something interesting to think about over lunch (for me anyway). 8)




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