This is a question from binomial theorem. How do i approach these problems, can we find the coefficient of any arbitrary power of x, if there is some particular concept linked to these problems? Please help
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1Why do you need to use the binomial theorem? Can't you just expand? – Kenta S Mar 01 '21 at 13:15
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@KentaS is it viable to expand it in case of higher power of x? – Soumil Gupta Mar 01 '21 at 13:16
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@Vega It's actually not such a big task to expand until you find the coefficient of $x^9$. Note that all the factors after $(1+x^9)$ become irrelevant, as to get an $x^9$ term we cannot multiply by any term $x^n$ where $n\geqslant 10$. – A-Level Student Mar 01 '21 at 14:30