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4x2-4x-120 = (2x+10)(2x-12) when factored
(2x+5)(2x+1)
The operators are missing, the possible factorisations are:4x2 + 10x + 6 = 2(2x + 3)(x + 1)4x2 - 10x + 6 = 2(2x - 3)(x - 1)4x2 + 10x - 6 = 2(2x - 1)(x + 3)4x2 - 10x - 6 = 2(2x + 1)(x - 3)
4x2+28x+49 = (2x+7)(2x+7) when factored
4x2-6.5 = 2.5