Operational signs would make this a lot easier. Assuming that's + 12x + 5, the answer is (2x + 1)(2x + 5)
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If you mean: x2-12x+35 then it is (x-7)(x-5) when factored
If you mean: 4x squared+12x-40 then it is (x+5)(x-2) after dividing all terms by 4
2(2x + 5)(2x - 5)
4x2+20x+25 (2x+5)^2
x2-12x+35 = (x-5)(x-7)