You are Here: Home >< Maths

# What does In x mean? (C3)

Announcements Posted on
TSR's new app is coming! Sign up here to try it first >> 17-10-2016
1. My maths teacher set us homework on mymaths and for the first part, we have to rearrange the equations into the form f(x)=0.
One of the equations is In 2x = 3. I have never came across 'In' before, although I have seen it on calculators. How do you put this equation in the form f(x) = 0 and what on Earth is In and what are you supposed to do with it?
2. .
The natural logarithm.
You do not put it in f(x)=0 form.
It's by definition. If .
3. ln is log base e. So similar if it was log base 10 on the left you'd make the right log10^3 and then remove logs from both sides.

So ln2x=3
ln2x=lne^3
2x=e^3
x=1/2(e^3)
4. (Original post by jessyjellytot14)
My maths teacher set us homework on mymaths and for the first part, we have to rearrange the equations into the form f(x)=0.
One of the equations is In 2x = 3. I have never came across 'In' before, although I have seen it on calculators. How do you put this equation in the form f(x) = 0 and what on Earth is In and what are you supposed to do with it?
If you just want to put it into the form f(x) = 0, then surely all you have to do is write

ln(2x) - 3 = 0

No?
5. It means L times by N times by 2x.
Spoiler:
Show
Kappa

## Register

Thanks for posting! You just need to create an account in order to submit the post
1. this can't be left blank
2. this can't be left blank
3. this can't be left blank

6 characters or longer with both numbers and letters is safer

4. this can't be left empty
1. Oops, you need to agree to our Ts&Cs to register

Updated: July 5, 2016
TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
Today on TSR

### How does exam reform affect you?

From GCSE to A level, it's all changing

Poll
Useful resources

### Maths Forum posting guidelines

Not sure where to post? Read here first

### How to use LaTex

Writing equations the easy way

### Study habits of A* students

Top tips from students who have already aced their exams