You are Here: Home >< Maths

# Newton - Raphson question watch

1. Find all solutions using the Newton Raphson method correct to 4dp of

5x + ln(x)=10,000

Intuitively I thought one of my solutions should be around 2000. However, my working out alludes to something completely different and I cant quite see where I've gone wrong. I'll post my working out next ...
3. (Original post by ElDonCorleone)
...

You forgot the 10000
4. i) make it equal zero:

5x + ln(x) - 10000 = 0

f(x) = 5x + ln(x) - 10000

f'(x) = 5 + 1/x

then put these together...

xn+1 = xn - f(xn)/f'(xn)
5. (Original post by RDKGames)

You forgot the 10000
Ahh so trivial, thanks!

### Related university courses

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: March 8, 2018
Today on TSR

### He broke up with me because of long distance

Now I'm moving to his city

### University open days

1. Norwich University of the Arts
Thu, 19 Jul '18
2. University of Sunderland
Thu, 19 Jul '18
3. Plymouth College of Art
Thu, 19 Jul '18
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