C2 Binomial. Is there an alternative way to work this out? Watch

loveisjustasong
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Find p in (1-2x)^p. I know how to work this out using the 1 + n(n-1)/2 etc. formula but is there a different way? For example, if they asked you to work out (3-2x)^p , how would you about doing that? Would they ask you questions like this or will they just stick to questions with 1 being the first number?
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generalebriety
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If p is an integer (which it always will be in C2), there's no reason you can't use the same sort of formula - it's given in the formula book, if I remember rightly. And no, there isn't really another way of doing it other than actually multiplying out all the brackets.

(If p is not an integer, just factorise it into 3^p (1 - \frac{2}{3}x)^p, and expand binomially from there. But you won't meet this till C4!)
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gman2k8
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(Original post by generalebriety)
If p is an integer (which it always will be in C2), there's no reason you can't use the same sort of formula - it's given in the formula book, if I remember rightly. And no, there isn't really another way of doing it other than actually multiplying out all the brackets.

(If p is not an integer, just factorise it into 3^p (1 - \frac{2}{3}x)^p, and expand binomially from there. But you won't meet this till C4!)
Yhyh you just have to change that first number in the bracket to 1, its in the C2 book but in little detail and its way easier to do it the other way anyways.
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loveisjustasong
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What page?
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generalebriety
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(Original post by Get Cape.Wear Cape.Fly.)
What page?
I have no idea. I don't know what your exam board is or what its formula book looks like, but I imagine it'll be on the C2 page.
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gman2k8
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(Original post by Get Cape.Wear Cape.Fly.)
What page?
If you got the Heinemann Green Edexcel book then its page 79 the last thing in that summary box.
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