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

Explanation

To verify that \(x + a\) is a factor of \(x^n + a^n\) for any odd positive integer \(n\) using the factor theorem, we can follow these steps:

### Step 1: Define the Polynomial
We start with the polynomial:
\[ f(x) = x^n + a^n \]

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