# Binomial expansion

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(2x + y) to the 5th power

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##### Solution Summary

This uses binomial expansion to write a polynomial.

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In general the formula is as follow:

(a+ b)^n= sum(k(up)=n, k(low)=0)[C(n, n-k) a^(n-k) b^(k)]

where C(n, n-k) means n choose ...

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