12x^2x - 34x - 28
I think you meant 12x^2 - 34x - 28
Take 2 common
2( 6x^2 - 21x + 4x -14)
2( 3x ( 2x -7) + 2 ( 2x-7)) taking 3 and 2 common .
2 x (2x-7)(3x+2)
Therefore final answer is 2 × (2x-7)(3x+2) .
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