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8x2 - 12x - 8 = 4 (2x2 - 3x - 2)

= 4 (2x2 + x - 4x - 2)

= 4 (x (2x + 1) - 2 (2x + 1))

= 4 (x - 2) (2x + 1).

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14y ago

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