4x
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The GCF is 4x2.
X3 - 4X2 - 45XX(X2 - 4X - 45)=============X is only common factor here.
If you mean: 4x squared+12x-40 then it is (x+5)(x-2) after dividing all terms by 4
If that's + 4x2, the answer is 2x(x2 + 2x - 4)
Operational signs would make this a lot easier. Assuming that's + 12x + 5, the answer is (2x + 1)(2x + 5)