a problem from the textbook

For students of class 9-10 (age 14-16)
Shapnil
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Joined: Mon Dec 19, 2011 2:05 pm

a problem from the textbook

Unread post by Shapnil » Fri Jan 25, 2013 1:43 pm

This problem is from text book of class 9-10.but I'm a little bit confused about it. Please help.
What is domain of the following function :
$F(x)=\ln x$
Last edited by Phlembac Adib Hasan on Fri Jan 25, 2013 9:52 pm, edited 1 time in total.
Reason: $L^AT_EX$-ed and also removed the last line

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nafistiham
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Re: a problem from the textbook

Unread post by nafistiham » Fri Jan 25, 2013 2:18 pm

for $\ln(x)$, $x$ can not be negative. So, $x>0$ is the domain.
for more, see the Graph
or visit Wikipedia.

And about equation editor, I think something is going wrong. You may bookmark it. Moreover, you could just use two $ around the equation and latex it. It is so easy. equation editor won't help you inserting $$. right ?
\[\sum_{k=0}^{n-1}e^{\frac{2 \pi i k}{n}}=0\]
Using $L^AT_EX$ and following the rules of the forum are very easy but really important, too.Please co-operate.
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Shapnil
Posts: 10
Joined: Mon Dec 19, 2011 2:05 pm

Re: a problem from the textbook

Unread post by Shapnil » Sat Jan 26, 2013 9:02 am

ya i've done the same.bt in the answer sheet of the text book it is x≥0.that's why i was confused.thanks

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nafistiham
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Re: a problem from the textbook

Unread post by nafistiham » Sun Jan 27, 2013 1:24 pm

In Bangladesh, most times, you can believe yourself, than the text books' answer.
Because, here, doing everything correctly is too hard for so many people, where, one student can have more confidence on himself, if he practices enough.
Still, thanks for sharing.
Now, anyone who'll see the post will now about the mistake. :)
\[\sum_{k=0}^{n-1}e^{\frac{2 \pi i k}{n}}=0\]
Using $L^AT_EX$ and following the rules of the forum are very easy but really important, too.Please co-operate.
Introduction:
Nafis Tiham
CSE Dept. SUST -HSC 14'
http://www.facebook.com/nafistiham
nafistiham@gmail

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