Unfortunately, the browser used by Answers.com for posting questions is incapable of accepting mathematical symbols. This means that we cannot see the mathematically critical parts of the question. We are, therefore unable to determine what exactly the question is about and so cannot give a proper answer to your question. Please edit your question to include words for symbols and resubmit. There is no symbol between 65x2 and 85x. Assuming that it is meant to be +85x, the expression has no rational factors.
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a proper factor is a factor.
a factor bug is a factor
A composite factor is a factor that is a composite number, as opposed to a prime factor which is a factor that is a prime number.
Factors are divisors. A factor times a factor will equal a product.
If it does not factor properly then you cannot factor it.