4s2 - 9 can be expressed by using the identity: a2 - b2 = (a-b)(a+b)
Therefore, 4s2 - 9 = (2s)2 - 32 = (2s-3)(2s+3)
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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.
If it does not factor properly then you cannot factor it.
Factors are divisors. A factor times a factor will equal a product.