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# C3 numerical methods URGENT HELP NEEDED watch

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

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