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# imaginary binomial expansion watch

1. so as i was flicking through the edexcel c4 textbook (i always do that before starting a textbook :P) i found the binomial expansion for (a+bx)^n where n can be fractions or negative numbers.....

what about i? don't know if it's in FP2 or 3 and you probably go over it at uni but can someone brief me over it as im curious cause when you use the n+nx+n(n-1)/2! etx formula (probs got the beginning wrong) you can't really find i!
2. (Original post by Toasticide)
so as i was flicking through the edexcel c4 textbook (i always do that before starting a textbook :P) i found the binomial expansion for (a+bx)^n where n can be fractions or negative numbers.....

what about i? don't know if it's in FP2 or 3 and you probably go over it at uni but can someone brief me over it as im curious cause when you use the n+nx+n(n-1)/2! etx formula (probs got the beginning wrong) you can't really find i!

Well, according to wikipedia, the binomial series works for any power where .

Therefore, I guess it would be the same as having a real power...

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Updated: January 14, 2017
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