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# C2 Binomial Expansion watch

1. Hi everyone,

I'm hoping you can help me with a certain style of C2 Binomial Expansion.

I would like to know how to solve -

When you have values for a & b, and a coefficient of a term in the expansion but you need to find the value of p.

What would be the procedure of doing this?

Thanks - Andy.
Sorry - I forgot something - you know the coefficient of a term in the expansion also.
4. Well, what would you do if you had P and needed to find the coefficient. Just do the same and you should get an equation you can solve.
5. hey there
I believe you can do this by expanding it and then equating the two coefficients

Coefficient of in
where P is greater than 0
So expanding to find

I personally prefer the NCr formula but i can't seem to get it on latex.
Anyway

I'm pretty sure you can solve the rest yourself. Good luck!

For future reference and cause i'm lazy this was Question 4 Exercise 5D of the C2 edexcel book

And apologies if this counts as a full solution, I aimed to do it as an example to the OP to show the method and did not go all the way to finding the answer
6. The coefficient of which term, it's simply working backwards. Is it the a^2 term? etc?
7. (Original post by MinpoloD)
hey there
I believe you can do this by expanding it and then equating the two coefficients

Coefficient of in
where P is greater than 0
So expanding to find

I personally prefer the NCr formula but i can't seem to get it on latex.
Anyway

I'm pretty sure you can solve the rest yourself. Good luck!

For future reference and cause i'm lazy this was Question 4 Exercise 5D of the C2 edexcel book

And apologies if this counts as a full solution, I aimed to do it as an example to the OP to show the method and did not go all the way to finding the answer
I think you made it too complicated when you could have just used n(n-1) /1x2 x^2 formula and from there its easier but i do see ur point
8. (Original post by Education_1)
I think you made it too complicated when you could have just used n(n-1) /1x2 x^2 formula and from there its easier but i do see ur point
why reply to a thread which is over 6 months old just to to tell me my method is too complicated?
9. (Original post by MinpoloD)
why reply to a thread which is over 6 months old just to to tell me my method is too complicated?
Sorry MinpoloD i didnt realised that this thread was over 6 months (I'm kinda getting used to student room).. no dont minunderstand me I was just saying for the benefit of other people who is seeing this because my teacher didnt actually explain anything .. >< anyway your post of helpful I must admit because I was stuck on some question and I saw your reply.. thank you for explaining .. I didnt mean to offend

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