You are Here: Home >< Maths

# Hard maths equation! Watch

1. Hi, I'm getting stuck on the equation 50e^x(10x)=20
I can work it down to x + ln(x) = ln (1/25), which I'm pretty sure is correct.
But I dont know how to work the ln bit out at all.

Any help would be appreciated, thanks!
2. (Original post by Student10011)
Hi, I'm getting stuck on the equation 50e^x(10x)=20
I can work it down to x + ln(x) = ln (1/25), which I'm pretty sure is correct.
But I dont know how to work the ln bit out at all.

Any help would be appreciated, thanks!
That cannot be solved algebraically, you would need to use Numerical Methods
3. (Original post by Student10011)
Hi, I'm getting stuck on the equation 50e^x(10x)=20
I can work it down to x + ln(x) = ln (1/25), which I'm pretty sure is correct.
But I dont know how to work the ln bit out at all.

Any help would be appreciated, thanks!
do you mean 50e^(10x^2)=20 ?
4. Yes this cannot be solved algebraically ^^.

Was trying for the last ten minutes
5. (Original post by alow)
do you mean 50e^(10x^2)=20 ?
No, just 10x, it can be solved, I have an estimate of around 0.925/25. It seems from what others say, it can't be done algebraically. Thanks though.

6. SOLVED IT! Did it myself. I made the equation an iterative formula, and after many = presses on the calc, it terminated at a finite decimal number of 0.03848966594!

Thanks everyone
7. (Original post by Student10011)

SOLVED IT! Did it myself. I made the equation an iterative formula, and after many = presses on the calc, it terminated at a finite decimal number of 0.03848966594!

Thanks everyone
Look up the Newton-Raphson method if you're interested in solving by numerical methods.
8. (Original post by Student10011)

SOLVED IT! Did it myself. I made the equation an iterative formula, and after many = presses on the calc, it terminated at a finite decimal number of 0.03848966594!

Thanks everyone
Well done - discovering maths for yourself is great

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:
Updated: August 18, 2013
Today on TSR

### Degrees to get rich!

... and the ones that won't

### Women equal with Men?

Discussions on TSR

• Latest
• ## See more of what you like on The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

• Poll
Useful resources

### Maths Forum posting guidelines

Not sure where to post? Read the updated guidelines here

### How to use LaTex

Writing equations the easy way

### Study habits of A* students

Top tips from students who have already aced their exams

## Groups associated with this forum:

View associated groups
Discussions on TSR

• Latest
• ## See more of what you like on The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

• The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.