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Is there a formula for the binomial expansion of $ (a-b)^n$?
Like there is a formula for the binomial expansion of $(a+b)^n$ that can be neatly and compactly be written as a summation, does there exist an equivalent formula for $(a-b)^n$ ?
How to simplify $a^n - b^n$? - Mathematics Stack Exchange
How to simplify $a^n - b^n$? If it would be $(a+b)^n$, then I could use the binomial theorem, but it's a bit different, and I have no idea how to solve it. Thanks in ...
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