You are Here: Home

# C3 numerical methods URGENT HELP NEEDED

Announcements Posted on
TSR's new app is coming! Sign up here to try it first >> 17-10-2016

1. Hi I really don't understand how you would work these questions out, thanks for any help. (It's questions 2 and 4 that I don't understand)
2. (Original post by Meggy moo 1)

Hi I really don't understand how you would work these questions out, thanks for any help. (It's questions 2 and 4 that I don't understand)
Are you supposed to be using the Newton-Raphson method? If so you just use the iterative formula .
3. (Original post by B_9710)
Are you supposed to be using the Newton-Raphson method? If so you just use the iterative formula .
Sorry I don't know what that is as I've never been taught it
4. You only have to try the numbers 0,1,2,3,4,5 because it says integer, if you're really stuck, try them all until the equation equals zero
5. just look up iterative formula on exam solutions, I'm pretty sure in question 2 your trying to find N,N+1, so for example say N=1, Then the interval is 1to 2.
So input x=1 and x=2 into the equation and one answer should be negative and one positive, which indicates the graph has gone through the x axis between 1 & 2 hence the root {y=0 or f(x)=0} falls between 1&2 as there is a change of sign (+ to -).
6. (Original post by Donkey******)
You only have to try the numbers 0,1,2,3,4,5 because it says integer, if you're really stuck, try them all until the equation equals zero
I did that and I managed to complete the exercise correctly now, thank you!

(Original post by philo-jitsu)
just look up iterative formula on exam solutions, I'm pretty sure in question 2 your trying to find N,N+1, so for example say N=1, Then the interval is 1to 2.
So input x=1 and x=2 into the equation and one answer should be negative and one positive, which indicates the graph has gone through the x axis between 1 & 2 hence the root {y=0 or f(x)=0} falls between 1&2 as there is a change of sign (+ to -).
That made a lot of sense when I tried the work again, thanks

## 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: August 11, 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

### Who would you like to thank?

Poll
Useful resources
Study resources

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.