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= 2x^2 - 8x + 3x - 12
= 2x (x-4) +3 (x-4)
= (x-4) (2x+3)
2. 16 - 34x + 4x^2
= 16 - 32x - 2x + 4x^2
= 16 (1-2x) -2x (1- 2x)
= (1-2x) (16-2x)