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# C2 binomial expansion

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1. https://b940eb267c31463d4d23ccfd3105...%20Edexcel.pdf

help with 3a with the 3rd term in the expansion please.

so far i have

not sure about the power which goes on the x/4 and how to express as a coefficient
2. (Original post by thefatone)
https://b940eb267c31463d4d23ccfd3105...%20Edexcel.pdf

help with 3a with the 3rd term in the expansion please.

so far i have

not sure about the power which goes on the x/4 and how to express as a coefficient
I recommend you use the formula given in the Edexcel formula book for:

3. (Original post by notnek)
I recommend you use the formula given in the Edexcel formula book for:

i see... are you supposed to learn about that or is it just given and you know how to use it?
4. (Original post by thefatone)
i see... are you supposed to learn about that or is it just given and you know how to use it?
Both?
5. (Original post by Zacken)
Both?
... so how would you get the 3rd term of the expansion of

6. (Original post by thefatone)
... so how would you get the 3rd term of the expansion of

It's given in the booklet, it's
7. (Original post by Zacken)
It's given in the booklet, it's
would i ever need to "show" that ?
8. (Original post by thefatone)
would i ever need to "show" that ?
No.But it's not hard:
9. (Original post by thefatone)
https://b940eb267c31463d4d23ccfd3105...%20Edexcel.pdf

help with 3a with the 3rd term in the expansion please.

so far i have

not sure about the power which goes on the x/4 and how to express as a coefficient
if you did c4 this question would have made more sense, binomial questions to the power of N has never come up on edexcel papers. But as stated below you would need to do the long method of working it out
10. (Original post by thefatone)
https://b940eb267c31463d4d23ccfd3105...%20Edexcel.pdf

help with 3a with the 3rd term in the expansion please.

so far i have

not sure about the power which goes on the x/4 and how to express as a coefficient
finding and simplifying in part a should still be in terms of n, then for part be you can use that to answer
11. (Original post by Zacken)
No.But it's not hard:
I see thanks a ton
wait when does n factorial expand to all those brackets????
12. (Original post by thefatone)
I see thanks a ton
wait when does n factorial expand to all those brackets????
What does the factorial represent?

Or

Or...

It's not hard if you just think for a bit.
13. (Original post by thefatone)
I see thanks a ton
wait when does n factorial expand to all those brackets????
imagine 5! ... 5x4x3 etc... minusing 1 each time
14. (Original post by Zacken)
What does the factorial represent?

Or

Or...

It's not hard if you just think for a bit.
thanks

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