Use factor theorem to prove that (x+a) is a factor of `(x^(n)+a^(n))` for any odd positive integer n .

Explanation

`(-1)*(-1)=`

`1*(-1)=(-1)`

`(-1)*(-1)*(-1)=(-1)^3=(-1)`

`(-1)^n=1` when n is even

`(-1)^n=-1` when n is odd.

`f(x)=x^n+a^n`

`x=-a`and then Remainder=0

`f(-a)=(-a)^n+a^n`

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