Assuming the missing signs are pluses, that factors to (x + 6)(x + 6)
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x2+9x-36 = (x-3)(x+12) when factored
x2-12x+35 = (x-5)(x-7)
If you mean: x2-12x+35 then it is (x-7)(x-5) when factored
(12x - 6)(12x + 6)
If you are looking for common factors of 12x and 9 it would be 3.