Hey! Sign in to get help with your study questionsNew here? Join for free to post
 You are Here: Home >< Maths

# C2 Proof

Announcements Posted on
Four hours left to win £100 of Amazon vouchers!! Don't miss out! Take our short survey to enter 24-10-2016
1. How to prove the sum of a geometric sequence

i got this so far

what to do next?
Spoiler:
Show
Of course i've proved it i just want someone to show me why they do each step instead of me brainlessly proving it without understand doing it xD
2. (Original post by thefatone)
How to prove the sum of a geometric sequence

i got this so far

what to do next?
Spoiler:
Show
Of course i've proved it i just want someone to show me why they do each step instead of me brainlessly proving it without understand doing it xD
Subtract the two so that most of the terms cancel out.
3. (Original post by Zacken)
Subtract the two so that most of the terms cancel out.
ok
lets call rSn 2 and Sn 1
1-2
???
4. (Original post by thefatone)
ok
lets call rSn 2 and Sn 1
1-2
???
No. Try again, what does subtraction mean? Do you understand the difference between subtraction and addition? How did you get ?
5. (Original post by Zacken)
No. Try again, what does subtraction mean? Do you understand the difference between subtraction and addition? How did you get ?
To me

right i see so it must be thanks for clearing that up
6. (Original post by thefatone)
To me

right i see so it must be thanks for clearing that up
Yep.
7. (Original post by Zacken)
Yep.
phew that was close almost asked for help on the integration question(8) then realised i made a mistake on the first bit
where i said

the gradient of the normal is

when i said earlier on

at least i didn't get it wrong and the last question was a show ^-^ what a lifesaver "show" is....
8. (Original post by thefatone)
phew that was close almost asked for help on the integration question(8) then realised i made a mistake on the first bit
where i said

the gradient of the normal is

when i said earlier on

at least i didn't get it wrong and the last question was a show ^-^ what a lifesaver "show" is....
Good going.
9. (Original post by Zacken)
Good going.
phew hopefully 100% in this paper ....

hope
10. Good job.
11. (Original post by Zacken)
Good job.
https://b940eb267c31463d4d23ccfd3105...%20Edexcel.pdf
question 3

where do they get the y value of 3 from????
12. (Original post by thefatone)
https://b940eb267c31463d4d23ccfd3105...%20Edexcel.pdf
question 3

where do they get the y value of 3 from????
Uhm... you have the equation y = x + 4/x^2 that gives you the y coordinate for every x coordinate you plug in...
13. (Original post by Zacken)
Uhm... you have the equation y = x + 4/x^2 that gives you the y coordinate for every x coordinate you plug in...
yes so i got 2 as an x-cood oh poop....
lost another mark there *cries

Write a reply…

Submit reply

## Register

Thanks for posting! You just need to create an account in order to submit the post
1. this can't be left blank
that username has been taken, please choose another Forgotten your password?
2. this can't be left blank
this email is already registered. Forgotten your password?
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
your full birthday is required
1. Oops, you need to agree to our Ts&Cs to register
2. Slide to join now Processing…

Updated: May 22, 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

### Who is getting a uni offer this half term?

Find out which unis are hot off the mark here

Poll
Useful resources

## Make your revision easier

### 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

Can you help? Study help unanswered threads

## Groups associated with this forum:

View associated groups
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.