This is a difference of two square, so you can apply the factoring rule for the difference of two squares.
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A factor is a number or algebraic expression by which another is exactly divisible. A positive factor is a factor that is a positive number as opposed to a negative one.
The greatest common factor (GCF) refers to a factor that is COMMON to two or more numbers or expressions. You have only one expression in the question! The greatest factor of any expression is itself.
Eighty-one quintillion.
3x2 + 6x is ONE expression. A common factor is a factor that is COMMON to two (or more) expressions - not just one. An alternative answer: 3x can be factored out of both of those.
It is one hundred eighty three and one hundred eighty three thousandths.