[Binomial] Binomial theorem

[mkcoldwolf]

Remake
In the video, it does not use nCr because its not M2 education, well we can look at the formula below

binomial_theorem.png (96.34 KiB) Viewed 53548 times

P.S. However, when the formula becomes (a-b)^n ,the b is now -b
while it is affacted by the power k, so it will becomes (item)-(item)+(item)-(item)
References:
https://ncalculators.com/algebra/a-b-n- ... ansion.htm