The operators are missing, the possible factorisations are:
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4x2-4x-120 = (2x+10)(2x-12) when factored
(2x+5)(2x+1)
Do you mean 3x2+10x-8 if so then it is (3x-2(x+4) when factored
-10x-6 = -12 -10x = -12+6 -10x = -6 x = 3/5