factor out a 3x 3x(x-3)=3x2-9x
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.
Since 3x is a factor of 3x^2, it is automatically the GCF.
You can take a 3x2 out of both of those, leaving 1 and 3x.
4(x-1)(3x+1)
x(3x-2)
x(3x-4)
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The GCF is 3x
The GCF of 6x and 9x is 3x
3x2 + 2x - 21 = (3x - 7) (x + 3)
The Greatest Common Factor is 3.