Since 3x is a factor of 3x^2, it is automatically the GCF.
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3X2 - 3X 3X(X - 1) -----------------------factored, so 3X is gfc
factor out a 3x 3x(x-3)=3x2-9x
3x2 + 2x - 8 = 3x2 + 6x - 4x - 8 = 3x(x+2) - 4(x+2) = (3x-4)*(x+2)
The GCF is 3x.
3x2-9x-30 =3x2+6x-15x-30 =3x(x+2)-15(x+2) =(3x-15)(x+2) OR 3(x - 5)(x+2)