Prove the following is valid only when n is an odd integer.(adsbygoogle = window.adsbygoogle || []).push({});

x^n + 1= (x+1)(x^n - X^n-2 + ... + (x^2 - x + 1).

It's an easy 3 line proof.

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Fermat proof

**Physics Forums | Science Articles, Homework Help, Discussion**