Your factors must begin 3x and x to give 3x2. The factors of 12 are 1/12, 2/6 and 3/4. Which pair, together with 3x and x, can add to -5? 3 and 4 seem to fit the bill:
(3x + 4)(x - 3)
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3x(6x - 1)
It is: (3x+4)(2x-3) when factored
(x + 3)(3x - 2)
3x2-x-2 = (3x+2)(x-1)
It is: (2x+3)(3x-8) when factored