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 :

$F(x)=\ln x$

## a problem from the textbook

### a problem from the textbook

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*- nafistiham
**Posts:**829**Joined:**Mon Oct 17, 2011 3:56 pm**Location:**24.758613,90.400161-
**Contact:**

### Re: a problem from the textbook

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 ?

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.

Using $L^AT_EX$ and following the rules of the forum are very easy but really important, too.Please co-operate.

### Re: a problem from the textbook

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

- nafistiham
**Posts:**829**Joined:**Mon Oct 17, 2011 3:56 pm**Location:**24.758613,90.400161-
**Contact:**

### Re: a problem from the textbook

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.

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.

Using $L^AT_EX$ and following the rules of the forum are very easy but really important, too.Please co-operate.