2(2x2 - x - 6) = 2(2x + 3)(x - 2)
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If it does not factor properly then you cannot factor it.
The common factor would be n.
I would call an odd number factor a factor that is an odd number. I would call a number with an odd number of factors a perfect square.
Increasing by a factor of ten is to multiply by 10. By extension, decreasing by a factor of 2 would be to divide by 2.
If that was - 10x + 21, it would factor to (x - 3)(x - 7) If that was + 10x + 21, it would factor to (x + 3)(x + 7) As it is, the solutions are irrational.