Find a number that evenly divides each term of the expression.
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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.
Whatever expression will lead you to the whole number 10.
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.
The GCF is 12.
Whatever expression equals 22.