Yes. You must use the "slip and slide" factoring method because there is a 2 coefficient infront of x2.
2x2-12x-80 = (x-10)(2x+8)
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Yes because dividing all terms by 2 it becomes x2-6x-40 = (x-10)(x+4) when factored
2(x + 4)(x - 10)
If you mean: 2x2-11x+5 then it is (2x-1)(x-5) when factored
4x2+12x = 4x(x+3) when factored
Do you want its factorisation? 2x3 + 2x2 - 12x = 2x(x2 + x - 6) = 2x(x + 3)(x - 2).