(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

This is the given Theorem in my book, everything seems fine except that I cannot figure how they expanded (x^{n}- a^{n})

2. Relevant equations

The Binomial Theorem

3. The attempt at a solution

According to me (x^{n}- a^{n}) = {[(x+a)-a]^{n}- a^{n}} and expanding it would yield terms containing the^{n}C_{0},^{n}C_{1}etc. but they haven't shown anything like this where did all this disappear ? Plus I know that (x-a) would come out common and get cancel by (x-a) in the denominator.

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# Homework Help: Expanding x^n-a^n without Binomial Theroem ?

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