Answer :

Without the expression that $7x^3 + 27x^2 + 9x - 27$ might be a factor of, it is impossible to determine if it is indeed a factor.

- The problem is incomplete as it lacks the expression to be factored.
- Polynomial long division or root checking cannot be performed without the complete problem statement.
- Therefore, the question is unanswerable.
- The final answer is that we cannot determine if the polynomial is a factor.

### Explanation
1. Problem Analysis
The question asks whether the polynomial $7x^3 + 27x^2 + 9x - 27$ is a factor of some expression. However, the expression that it might be a factor of is missing. Therefore, without knowing the expression, we cannot determine if the given polynomial is a factor.

2. Explanation
Since the expression is missing, we cannot perform polynomial long division or synthetic division to check if the given polynomial is a factor. We also cannot determine if the roots of the given polynomial are also roots of the missing expression.

3. Conclusion
Therefore, the question is unanswerable with the information provided. We need the expression that $7x^3 + 27x^2 + 9x - 27$ might be a factor of in order to answer the question.

### Examples
In polynomial factorization, similar to prime factorization of integers, we determine if a given polynomial can be expressed as a product of other polynomials. This is used in various applications such as solving polynomial equations, simplifying expressions, and designing control systems in engineering.

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