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# C4 binomial series expansion question Watch

1. Hi, can anyone help me with part (b) of question 4? I don't have a clue where to start with it.

I've got the answer to part (a) if that's needed for the question. It's 1+(3x/10)+(3x^2/50)+(x^3/100).
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2. (Original post by Hannie Rose)
Hi, can anyone help me with part (b) of question 4? I don't have a clue where to start with it.

I've got the answer to part (a) if that's needed for the question. It's 1+(3x/10)+(3x^2/50)+(x^3/100).
not hard
3. If you're struggling write out the first 3,4 or 5 terms. Then look for a general pattern in the coefficients of the terms. Also don't write out the coefficients in any simplified form just write it out as products.
4. Expand using n instead of 3, for the first 3 or 4 terms.
Then, take out a factor of 1/10^n.
You should end up with the other part to simplify into the form requested.
5. Ive tried this still cant see whats going on ive done it where the powers -n too

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