# C2 Binomal Expansion - Sixth form

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#1
Please can someone help me with this question. I have no clue on how to answer it.

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6 years ago
#2
(Original post by bigmansouf)
Please can someone help me with this question. I have no clue on how to answer it.

For a), first write out the expansion of (1+x)^n and then think about substitutions you could make for x.

Post any working/ideas you have if you're still stuck.
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#3
Please look at my work this is what I have done but still confused on what to do next

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6 years ago
#4
(Original post by bigmansouf)
Please look at my work this is what I have done but still confused on what to do next

You're making life far too difficult for yourself!

What are the 2 simplest values for x you could choose?
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#5
you could choose x=1 or x=2
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6 years ago
#6
(Original post by bigmansouf)
you could choose x=1 or x=2
Choosing x = 1 would give you which helps for the first part.

But choosing x = 2 gives , which isn't what you want.

What other value of x might you try?
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#7
choose x=1
i understand but im still confused about the expansion bit
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6 years ago
#8
(Original post by bigmansouf)
choose x=1
i understand but im still confused about the expansion bit
Which one - the second one or both parts?

Presumably in class your teacher has gone through the expansion of where n is a positive integer?
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#9
(Original post by davros)
Which one - the second one or both parts?

Presumably in class your teacher has gone through the expansion of where n is a positive integer?
Sorry i have been learning it myself the whole alevel due to unfortunate circumstances i have to learn by myself

I have purchase a dvd from http://s256376672.websitehome.co.uk/mathstutor.html
and m4ths.com

i have gone all the questions from the main edexcel c2 book but this question is the further extension question from Rosemary's Edexcel as Core Mathematics

http://www.amazon.co.uk/Core-Mathema...semary+edexcel

this is the only question i have yet to overcome 55-14ext-14.pdf
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6 years ago
#10
, so
(Original post by bigmansouf)
Sorry i have been learning it myself the whole alevel due to unfortunate circumstances i have to learn by myself

I have purchase a dvd from http://s256376672.websitehome.co.uk/mathstutor.html
and m4ths.com

i have gone all the questions from the main edexcel c2 book but this question is the further extension question from Rosemary's Edexcel as Core Mathematics

http://www.amazon.co.uk/Core-Mathema...semary+edexcel
OK, so have you seen the formula for expanding in terms of binomial coefficients?
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#11
yh i have seen it and applied it to understand the subject but somehow I dont understand this question
I will revise this topic and revise the question
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